docs: Various refinements ahead of launch

This is a series of changes across the documentation to improve the
overall first-user experience. Key changes:

  1. New "Express setup" section in the "Getting Started" page.
  2. Rename and reorder the left-hand menu bar components
  3. Fix various copyright dates
  4. Add presubmit animated gif to the pw_presubmit docs

Change-Id: I22a75ace8c2be15a6e5890d6e1b3618a1d53eefa
diff --git a/docs/index.rst b/docs/index.rst
index c42abc8..d8b5e12 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -9,11 +9,11 @@
   :hidden:
 
   Home <self>
+  docs/getting_started.md
   CODE_OF_CONDUCT.md
   CONTRIBUTING.md
-  docs/getting_started.md
   docs/embedded_cpp_guide
   docs/style_guide
-  docs/module_guide
   targets
-  modules
+  docs/module_structure
+  module_guides