docs: Adding the image from the README into the docs.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

docs/index.rst

diff --git a/docs/index.rst b/docs/index.rst
index 954900a..4c3e657 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -18,6 +18,10 @@
 .. warning::
     This documentation is currently a **work in progress**.
 
+.. image:: _static/skywater-pdk-logo.png
+    :align: center
+    :alt: SkyWater PDK Logo Image.
+
 
 .. _CurrentStatus: