Removes 8.x RNs and What's new from main (#6246)

* Removes 8.x RNs and What's new from main

* troubleshoots build error

* troubleshooting

* Fixes conflict

* bugfixes

* Update docs/index.asciidoc

* Update docs/release-notes.asciidoc

---------

Co-authored-by: nastasha.solomon <[email protected]>

Author: benironside

docs/release-notes.asciidoc

@@ -1,87 +1,5 @@
 [[release-notes]]
+[chapter]
 = Release notes
 
 This section summarizes the changes in each release.
-
-* <<release-notes-8.16.1, {elastic-sec} version 8.16.1>>
-* <<release-notes-8.16.0, {elastic-sec} version 8.16.0>>
-* <<release-notes-8.15.4, {elastic-sec} version 8.15.4>>
-* <<release-notes-8.15.3, {elastic-sec} version 8.15.3>>
-* <<release-notes-8.15.2, {elastic-sec} version 8.15.2>>
-* <<release-notes-8.15.1, {elastic-sec} version 8.15.1>>
-* <<release-notes-8.15.0, {elastic-sec} version 8.15.0>>
-* <<release-notes-8.14.3, {elastic-sec} version 8.14.3>>
-* <<release-notes-8.14.2, {elastic-sec} version 8.14.2>>
-* <<release-notes-8.14.2, {elastic-sec} version 8.14.2>>
-* <<release-notes-8.14.1, {elastic-sec} version 8.14.1>>
-* <<release-notes-8.14.0, {elastic-sec} version 8.14.0>>
-* <<release-notes-8.13.4, {elastic-sec} version 8.13.4>>
-* <<release-notes-8.13.3, {elastic-sec} version 8.13.3>>
-* <<release-notes-8.13.2, {elastic-sec} version 8.13.2>>
-* <<release-notes-8.13.1, {elastic-sec} version 8.13.1>>
-* <<release-notes-8.13.0, {elastic-sec} version 8.13.0>>
-* <<release-notes-8.12.2, {elastic-sec} version 8.12.2>>
-* <<release-notes-8.12.1, {elastic-sec} version 8.12.1>>
-* <<release-notes-8.12.0, {elastic-sec} version 8.12.0>>
-* <<release-notes-8.11.4, {elastic-sec} version 8.11.4>>
-* <<release-notes-8.11.3, {elastic-sec} version 8.11.3>>
-* <<release-notes-8.11.2, {elastic-sec} version 8.11.2>>
-* <<release-notes-8.11.1, {elastic-sec} version 8.11.1>>
-* <<release-notes-8.11.0, {elastic-sec} version 8.11.0>>
-* <<release-notes-8.10.4, {elastic-sec} version 8.10.4>>
-* <<release-notes-8.10.3, {elastic-sec} version 8.10.3>>
-* <<release-notes-8.10.2, {elastic-sec} version 8.10.2>>
-* <<release-notes-8.10.1, {elastic-sec} version 8.10.1>>
-* <<release-notes-8.10.0, {elastic-sec} version 8.10.0>>
-* <<release-notes-8.9.2, {elastic-sec} version 8.9.2>>
-* <<release-notes-8.9.1, {elastic-sec} version 8.9.1>>
-* <<release-notes-8.9.0, {elastic-sec} version 8.9.0>>
-* <<release-notes-8.8.2, {elastic-sec} version 8.8.2>>
-* <<release-notes-8.8.1, {elastic-sec} version 8.8.1>>
-* <<release-notes-8.8.0, {elastic-sec} version 8.8.0>>
-* <<release-notes-8.7.1, {elastic-sec} version 8.7.1>>
-* <<release-notes-8.7.0, {elastic-sec} version 8.7.0>>
-* <<release-notes-8.6.2, {elastic-sec} version 8.6.2>>
-* <<release-notes-8.6.1, {elastic-sec} version 8.6.1>>
-* <<release-notes-8.6.0, {elastic-sec} version 8.6.0>>
-* <<release-notes-8.5.3, {elastic-sec} version 8.5.3>>
-* <<release-notes-8.5.2, {elastic-sec} version 8.5.2>>
-* <<release-notes-8.5.1, {elastic-sec} version 8.5.1>>
-* <<release-notes-8.5.0, {elastic-sec} version 8.5.0>>
-* <<release-notes-8.4.3, {elastic-sec} version 8.4.3>>
-* <<release-notes-8.4.2, {elastic-sec} version 8.4.2>>
-* <<release-notes-8.4.1, {elastic-sec} version 8.4.1>>
-* <<release-notes-8.4.0, {elastic-sec} version 8.4.0>>
-* <<release-notes-8.3.3, {elastic-sec} version 8.3.3>>
-* <<release-notes-8.3.2, {elastic-sec} version 8.3.2>>
-* <<release-notes-8.3.1, {elastic-sec} version 8.3.1>>
-* <<release-notes-8.3.0, {elastic-sec} version 8.3.0>>
-* <<release-notes-8.2.3, {elastic-sec} version 8.2.3>>
-* <<release-notes-8.2.2, {elastic-sec} version 8.2.2>>
-* <<release-notes-8.2.1, {elastic-sec} version 8.2.1>>
-* <<release-notes-8.2.0, {elastic-sec} version 8.2.0>>
-* <<release-notes-8.1.3, {elastic-sec} version 8.1.3>>
-* <<release-notes-8.1.2, {elastic-sec} version 8.1.2>>
-* <<release-notes-8.1.1, {elastic-sec} version 8.1.1>>
-* <<release-notes-8.1.0, {elastic-sec} version 8.1.0>>
-* <<release-notes-8.0.1, {elastic-sec} version 8.0.1>>
-* <<release-notes-8.0.0, {elastic-sec} version 8.0.0>>
-* <<release-notes-8.0.0-rc2, {elastic-sec} version 8.0.0-rc2>>
-
-include::release-notes/8.16.asciidoc[]
-include::release-notes/8.15.asciidoc[]
-include::release-notes/8.14.asciidoc[]
-include::release-notes/8.13.asciidoc[]
-include::release-notes/8.12.asciidoc[]
-include::release-notes/8.11.asciidoc[]
-include::release-notes/8.10.asciidoc[]
-include::release-notes/8.9.asciidoc[]
-include::release-notes/8.8.asciidoc[]
-include::release-notes/8.7.asciidoc[]
-include::release-notes/8.6.asciidoc[]
-include::release-notes/8.5.asciidoc[]
-include::release-notes/8.4.asciidoc[]
-include::release-notes/8.3.asciidoc[]
-include::release-notes/8.2.asciidoc[]
-include::release-notes/8.1.asciidoc[]
-include::release-notes/8.0.asciidoc[]