Updating the docs to match latest skywater-pdk.
Taken from https://github.com/google/skywater-pdk
```
commit b5ff6174d9aa921f670f12a2893969fe4a516f6c (HEAD -> main, upstream/main)
Merge: 5e159bd 73e9c84
Author: Tim Ansell <me@mith.ro>
Date: Tue Nov 2 13:28:11 2021 -0700
Merge pull request #341 from mithro/sphinx-theme-fix
Update the sphinx theme
```
Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6ffa95d..b585a69 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,16 +1,22 @@
-git+https://github.com/SymbiFlow/sphinx_materialdesign_theme.git#egg=sphinx-symbiflow-theme
+git+https://github.com/SymbiFlow/sphinx_symbiflow_theme.git#egg=sphinx-symbiflow-theme
+
docutils
sphinx
sphinx-autobuild
+
# Verilog domain
sphinx-verilog-domain
# Verilog diagrams using Yosys + netlistsvg
sphinxcontrib-hdl-diagrams
+
# Module diagrams
git+https://github.com/SymbiFlow/symbolator.git#egg=symbolator
git+https://github.com/hdl/pyHDLparser.git#egg=hdlparse
+
# pycairo
# vext.gi
+
restructuredtext-lint
rstdoc
+
tabulate