[VOL-2875] Documentation update

- Updated the main landing page and overview documentation
- Added the lab setup (copied from CORD docs)
- Use forked sphinx-multiversion to publish docs, which allows versions
  to be listed at bottom of sidebar
- Updated logo and favicon, fixed CSS to make logo legible
- Use VERSION file to set the version in the sidebar
- Add more words to dictionary
- removed reload functionality that is nonworking in Sphinx 2.x
- Fixed lint/linkcheck issues

Change-Id: I032e67d76393778fc697944a6d5df9c8cdacbbc4
diff --git a/_templates/meta_refresh.html b/_templates/meta_refresh.html
new file mode 100644
index 0000000..b940c76
--- /dev/null
+++ b/_templates/meta_refresh.html
@@ -0,0 +1,8 @@
+<!--
+SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+SPDX-License-Identifier: Apache-2.0
+--!>
+<html><head>
+    <meta charset="UTF-8">
+    <meta http-equiv="refresh" content="0;url=master/index.html" />
+</head></html>