DOC-3234: Create an index page for all TinyMCE upgrade guides

modules/ROOT/nav.adoc

@@ -53,7 +53,7 @@
 **** xref:dotnet-projects.adoc[.NET projects]
 **** xref:bower-projects.adoc[Bower projects]
 **** xref:zip-install.adoc[{productname} .zip deployments]
-** xref:upgrading.adoc[Upgrading {productname}]
+** xref:upgrading.adoc[General upgrade information]
 * xref:how-to-guides.adoc[How-to guides]
 ** Learn the basics
 *** xref:basic-setup.adoc[Basic setup]
@@ -209,10 +209,11 @@
 **** xref:bundling-localization.adoc[UI localizations]
 **** xref:bundling-themes.adoc[Themes]
 ** xref:upgrading.adoc[Upgrading {productname}]
-** xref:migration-from-4x.adoc[Migrating from {productname} 4]
-** xref:migration-from-5x.adoc[Migrating from {productname} 5]
-** xref:migration-from-6x.adoc[Migrating from {productname} 6]
-** xref:migration-from-froala.adoc[Migrating from Froala]
+** xref:migration-guide.adoc[Migration guides]
+*** xref:migration-from-4x.adoc[Migrating from {productname} 4]
+*** xref:migration-from-5x.adoc[Migrating from {productname} 5]
+*** xref:migration-from-6x.adoc[Migrating from {productname} 6]
+*** xref:migration-from-froala.adoc[Migrating from Froala]
 ** xref:generate-rsa-key-pairs.adoc[Generate public key pairs]
 ** xref:understanding-editor-loads.adoc[Understanding editor loads]
 * xref:examples.adoc[Examples]

modules/ROOT/pages/migration-from-5x.adoc

@@ -1,4 +1,4 @@
-= Migrating from {productname} 5 to {productname} 7
+= Migrating from {productname} 5 to {productname} {release-version}
 :navtitle: Migrating from TinyMCE 5
 :description: Guidance for migrating from TinyMCE 5 to TinyMCE 7
 :keywords: migration, considerations, premigration, pre-migration

modules/ROOT/pages/migration-from-6x.adoc

@@ -1,4 +1,4 @@
-= Migrating from {productname} 6 to {productname} 7
+= Migrating from {productname} 6 to {productname} {release-version}
 :navtitle: Migrating from TinyMCE 6
 :description: Guidance for migrating from TinyMCE 6 to TinyMCE 7
 :keywords: migration, considerations, premigration, pre-migration

modules/ROOT/pages/migration-guide.adoc

@@ -0,0 +1,41 @@
+= TinyMCE Migration Guides
+:description: Comprehensive guides for upgrading between TinyMCE versions (4.x, 5.x, 6.x) and migrating from other rich text editors
+:keywords: migration, upgrade, version, tinymce 4, tinymce 5, tinymce 6, froala
+:title_nav: Migration Guides
+:toc: macro
+:toclevels: 2
+:toc-title: Version Migration Guides
+:toc-placement: preamble
+:toc-type: flat
+
+[cols="1,1"]
+|===
+
+a|
+[.lead]
+xref:migration-from-6x.adoc[Migrating from TinyMCE 6]
+
+Guide for upgrading from TinyMCE 6 to TinyMCE 7, covering configuration changes and UI component updates.
+
+a|
+[.lead]
+xref:migration-from-5x.adoc[Migrating from TinyMCE 5]
+
+Guide for upgrading from TinyMCE 5 to TinyMCE 7, including architectural improvements and security updates.
+
+a|
+[.lead]
+xref:migration-from-4x.adoc[Migrating from TinyMCE 4]
+
+Guide for upgrading from TinyMCE 4 to TinyMCE 7, detailing major architectural changes and modern UI improvements.
+
+a|
+[.lead]
+xref:migration-from-froala.adoc[Migrating from Froala]
+
+Guide for migrating from Froala Editor to TinyMCE, with equivalent feature mappings and configuration guidance.
+
+// Empty cell to even out rows
+a|
+
+|===