Adding initial Sphinx configuration.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/docs/Makefile b/docs/Makefile
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+# -*- coding: utf-8 -*-
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# The top directory where environment will be created.
+DOCS_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+TOP_DIR := $(realpath $(DOCS_DIR)/..)
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD     = sphinx-build
+SPHINXAUTOBUILD = sphinx-autobuild
+SPHINXPROJ      = open_source_pdks
+SOURCEDIR       = $(DOCS_DIR)
+BUILDDIR        = $(DOCS_DIR)/_build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/conf.py b/docs/conf.py
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+# -*- coding: utf-8 -*-
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+import docutils
+import os
+import re
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'Google maintained open source PDK'
+copyright = '2022, Google LLC'
+author = 'Google LLC'
+
+# The short X.Y version
+version = ''
+# The full version, including alpha/beta/rc tags
+release = ''
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.autosectionlabel',
+    'sphinx.ext.githubpages',
+    'sphinx.ext.ifconfig',
+    'sphinx.ext.mathjax',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.todo',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# Enable github links when not on readthedocs
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if not on_rtd:
+    html_context = {
+        "display_github": True,              # Integrate GitHub
+        "github_user": "google",             # Username
+        "github_repo": "open-source-pdks",   # Repo name
+        "github_version": "main",            # Version
+        "conf_py_path": "/docs/",
+    }
+else:
+    docs_dir = os.path.abspath(os.path.dirname(__file__))
+    print("Docs dir is:", docs_dir)
+    import subprocess
+    subprocess.call('git fetch origin --unshallow', cwd=docs_dir, shell=True)
+    subprocess.check_call('git fetch origin --tags', cwd=docs_dir, shell=True)
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The full version, including alpha/beta/rc tags.
+release = re.sub('^v', '', os.popen('git describe ').read().strip())
+# The short X.Y version.
+version = release
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = []
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = [
+    '_build',
+    'env',
+    'venv',
+    'Thumbs.db',
+    '.DS_Store',
+]
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+# -- Options for HTML output -------------------------------------------------
+
+# Prefix each section label with the name of the document it is in, followed by
+# a colon. For example, index:Introduction for a section called Introduction
+# that appears in document index.rst. Useful for avoiding ambiguity when the
+# same section heading appears in different documents.
+#autosectionlabel_prefix_document = True
+
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = "sphinx_symbiflow_theme"
+
+#html_logo = "_static/open-source-pdks-logo-top.png"
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+# https://sphinx-symbiflow-theme.readthedocs.io/en/latest/customization.html
+html_theme_options = {
+    'nav_title': 'Google maintained open source PDKs',
+
+    'color_primary': 'orange',
+    'color_accent': 'teal',
+
+    # Set the repo location to get a badge with stats
+    'github_url': 'https://github.com/google/open-source-pdks',
+    'repo_name': 'open-source-pdks',
+    'repo_type': 'github',
+
+    'globaltoc_depth': 0,
+    'globaltoc_collapse': True,
+
+    # Hide the symbiflow links
+    'hide_symbiflow_links': True,
+    'license_url' : 'https://www.apache.org/licenses/LICENSE-2.0',
+}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('open-source-pdks', 'Google maintained open source PDKs Documentation',
+     [author], 1)
+]
diff --git a/docs/requirements.txt b/docs/requirements.txt
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+++ b/docs/requirements.txt
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+git+https://github.com/f4pga/sphinx_f4pga_theme#egg=sphinx-symbiflow-theme
+
+docutils
+sphinx
+sphinx-autobuild