[do not merge!] Removes the combined Fleet Server and Elastic Agent release notes (#2818)

Related to elastic/docs-projects#488
elastic/elastic-agent-changelog-tool#213,
elastic/elastic-agent#9440,
elastic/fleet-server#5374

⚠️ **DO NOT MERGE BEFORE
elastic/docs-builder#1830 IS BOTH MERGED AND
INCLUDED IN A NEW RELEASE** ⚠️

Removes the combined Fleet Server and Elastic Agent release notes in
favor of separate release notes in the fleet-server and elastic-agent
repos. This enables the dev team to own the release notes process.

Author: colleenmcginnis

docset.yml

@@ -40,6 +40,7 @@ cross_links:
   - ecs-logging-python
   - ecs-logging-ruby
   - eland
+  - elastic-agent
   - elastic-serverless-forwarder
   - elastic-otel-dotnet
   - elastic-otel-java
@@ -55,6 +56,7 @@ cross_links:
   - elasticsearch-py
   - elasticsearch-rs
   - elasticsearch-ruby
+  - fleet-server
   - go-elasticsearch
   - integration-docs
   - integrations

get-started/versioning-availability.md

@@ -74,12 +74,12 @@ Want to learn more about how availability badges are used? Check the [Elastic Do
 
 Documentation for {{stack}} 8.19.0 and earlier is available at [elastic.co/guide](https://www.elastic.co/guide).
 
-If a previous version for a specific page exists, you can select the version from the dropdown in the page sidebar. 
+If a previous version for a specific page exists, you can select the version from the dropdown in the page sidebar.
 
 ### How often is the documentation updated?
 
 We frequently update Elastic Docs to reflect the following:
-* Minor versions, such as {{stack}} 9.1.0 
+* Minor versions, such as {{stack}} 9.1.0
 * Patch-level updates, such as {{stack}} 9.1.1
 * Ongoing improvements to clarify and expand guidance
 
@@ -141,7 +141,8 @@ Find the documentation for your Elastic product versions or releases.
 | --- | --- |
 | [Elasticsearch](elasticsearch://release-notes/index.md) | 9.0.0 and later |
 | [Kibana](kibana://release-notes/index.md) | 9.0.0 and later |
-| [Fleet and Elastic Agent](/release-notes/fleet-elastic-agent/index.md) | 9.0.0 and later |
+| [Elastic Agent](elastic-agent://release-notes/index.md) | 9.0.0 and later |
+| [Fleet](fleet-server://release-notes/index.md) 9.0.0 and later |
 | [Logstash](logstash://release-notes/index.md) | 9.0.0 and later |
 | [Beats](beats://release-notes/index.md) | 9.0.0 and later |
 | [Elastic Observability](/release-notes/elastic-observability/index.md) | 9.0.0 and later |

redirects.yml

@@ -307,7 +307,7 @@ redirects:
 # Related to https://github.com/elastic/docs-content/pull/2396
   'solutions/security/configure-elastic-defend/enable-access-for-macos-monterey.md': 'solutions/security/configure-elastic-defend/enable-access-for-macos.md'
   'solutions/security/configure-elastic-defend/enable-access-for-macos-ventura-higher.md': 'solutions/security/configure-elastic-defend/enable-access-for-macos.md'
-  
+
   # https://github.com/elastic/docs-content/pull/2658
   'explore-analyze/query-filter/languages/esql.md': 'elasticsearch://reference/query-languages/esql.md'
   'explore-analyze/query-filter/languages/esql-examples.md': 'elasticsearch://reference/query-languages/esql/esql-examples.md'
@@ -324,7 +324,7 @@ redirects:
 
 # Related to https://github.com/elastic/docs-content/pull/2639
   'deploy-manage/monitor/autoops/ec-autoops-dismiss-event.md': 'deploy-manage/monitor/autoops/ec-autoops-events.md'
-  
+
 # Related to https://github.com/elastic/docs-content/pull/2245/
   'solutions/search/elasticsearch-basics-quickstart.md': 'solutions/search/get-started/index-basics.md'
 
@@ -335,4 +335,9 @@ redirects:
   'solutions/search/api-quickstarts.md': 'solutions/search/get-started/quickstarts.md'
 
 # Related to https://github.com/elastic/docs-content/pull/2745
-  'solutions/search/run-elasticsearch-locally.md': 'deploy-manage/deploy/self-managed/local-development-installation-quickstart.md'
+  'solutions/search/run-elasticsearch-locally.md': 'deploy-manage/deploy/self-managed/local-development-installation-quickstart.md'
+
+  'release-notes/fleet-elastic-agent/index.md': 'fleet-server://release-notes/index.md'
+  'release-notes/fleet-elastic-agent/breaking-changes.md': 'fleet-server://release-notes/breaking-changes.md'
+  'release-notes/fleet-elastic-agent/deprecations.md': 'fleet-server://release-notes/deprecations.md'
+  'release-notes/fleet-elastic-agent/known-issues.md': 'fleet-server://release-notes/known-issues.md'

reference/fleet/fleet-agent-release-process.md

@@ -11,7 +11,7 @@ products:
 
 ## Scheduled releases
 
-{{agent}} follows a release process aligned with the broader {{stack}} release schedule. The latest features, enhancements, and fixes are documented in the [release notes](../../release-notes/fleet-elastic-agent/index.md).
+{{agent}} follows a release process aligned with the broader {{stack}} release schedule. The latest features, enhancements, and fixes are documented in the [release notes](elastic-agent://release-notes/index.md).
 
 ## Independent {{agent}} releases [independent-agent-releases]