TINYDOC-3601: Remove the stale plugin editor version compatibility page.

[kemister85]

Ticket: TINYDOC-3601

Site: Staging branch

Changes:

The plugin-editor-version-compatibility.adoc page has been removed. The page promised a compatibility matrix that did not exist, and once the stale June 2019 CDN URL note was set aside, its only remaining content was a premium plugin list already published on support.adoc through the same partial.

• Deleted modules/ROOT/pages/plugin-editor-version-compatibility.adoc.
• Added :page-aliases: plugin-editor-version-compatibility.adoc to modules/ROOT/pages/editor-plugin-version.adoc so the published URL redirects rather than returning a 404. This repository handles redirects through Antora page aliases, as used by 18 other pages.
• Preserved the one unique sentence from the deleted page as an IMPORTANT admonition in the "Specifying the Cloud Deployment of Plugins" section of editor-plugin-version.adoc.
• Removed the navigation entry from modules/ROOT/nav.adoc.
• Removed the table cell from modules/ROOT/pages/cloud-deployment-guide.adoc, along with the // Empty cell to even out rows padding cell. The table held five content cells plus one pad; removing one content cell leaves four, which fills two complete rows without padding.
• Removed the plugin-editor-version-compatibility case from the URL categorization logic in -scripts/generate-llm-files.js.
• Regenerated llms.txt and llms-full.txt.

partials/misc/plugin-support-table.adoc and partials/misc/premium-plugin-list.adoc are unchanged. Both are still in use: support.adoc includes the support table, and the premium plugin list is included by features-only.adoc and editor-and-features.adoc.

Accompanying correction to the generated LLM files:

Two version claims hardcoded in -scripts/generate-llm-files.js were inaccurate and are reprinted on every regeneration, so they are corrected here while the generated files are already being rebuilt:

Pre-checks:

• Branch is correctly prefixed: hotfix/8/TINYDOC-3601
• modules/ROOT/nav.adoc has been updated.
• Files have been included where required.
• Files removed have been deleted, not just excluded from the build.

Review:

• Documentation Team Lead has reviewed.