Update Sphinx version and versioning process

- Updated to newer Sphinx version
- Changed to use doc8 to check .rst files
- Added a dictionary (dict.txt) and spellchecking
- Reformatted and fixed issues that were found in the content

Change-Id: If7b35e01ee8be25dbbd1ecd0e67b264aa6cc2a94
diff --git a/_templates/meta_refresh.html b/_templates/meta_refresh.html
new file mode 100644
index 0000000..f836173
--- /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=1.12/index.html" />
+</head></html>