Merge pull request #1271 from plone/upgrade-upgrade-guide-1269

Promote the Plone 6 Upgrade Guide to the top level navigation

Author: stevepiercy

docs/deployment/index.md

@@ -20,6 +20,5 @@ Intro to chapter "deployment"
 
 provision
 scaling
-upgrade
 backup
 ```

docs/deployment/upgrade.md

@@ -18,6 +18,7 @@ This website is the HTML documentation of Plone, an open source, enterprise-leve
 
 overview/index
 install/index
+upgrade/index
 deployment/index
 volto/index
 plone.restapi/docs/source/index

docs/index.md

@@ -0,0 +1,35 @@
+---
+html_meta:
+  "description": "Plone 6 upgrade Guide"
+  "property=og:description": "Plone 6 upgrade guide"
+  "property=og:title": "Plone 6 upgrade guide"
+  "keywords": "Plone, upgrade"
+---
+
+(upgrade-guide-label)=
+
+# Plone 6 upgrade guide
+
+This guide will help the developer upgrade their Plone installation to version 6.x.
+
+Plone 6 has several components, each of which have their own upgrade process.
+
+- [Volto/frontend](volto/upgrade-guide/index)
+- [plone.restapi](plone.restapi/docs/source/upgrade-guide)
+- [backend (placeholder only)](backend/upgrading/index)
+- [backend](backend/upgrading/v60)
+
+
+```{todo}
+Determine whether these next two sections are necessary.
+```
+
+(upgrade-guide-from-5.x-label)=
+
+## From 5.x
+
+
+(upgrade-guide-from-6.x-label)=
+
+## From 6.x
+