Restructure Enterprise release notes into individual pages

[jpelletier1]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

This PR restructures the Enterprise release notes from a single long page into individual pages for better navigation and organization.

Changes Made

1. Created Individual Release Pages

• Created enterprise/releases/ directory
• Split 9 releases into separate pages (0.70.0 through 0.24.0)
• Each page includes:
  • Proper frontmatter (title, description)
  • Complete release content (features, bug fixes, maintenance)
  • Organized by component (Enterprise Server, SDK, Runtime API, Canvas, Helm Chart)

2. Updated Release Notes Overview

• Converted enterprise/release-notes.mdx to an overview/landing page
• Added introduction explaining the release notes structure
• Included highlights from the latest 3 releases
• Added "All Releases" section with links to individual pages
• Reduced file from 1,084 lines to 49 lines

3. Updated Navigation Structure

• Modified docs.json to show "Release Notes" as an expandable group
• Positioned under "Feature Guides" in the Enterprise tab
• Overview page appears first, followed by all release pages
• Maintains chronological order (newest to oldest)

User Experience Impact

In the Enterprise tab sidebar, users will now see:

Feature Guides
  └─ Release Notes ▼          (expandable group)
      ├─ Release Notes        (overview/landing page)
      ├─ Release 0.70.0       (individual release pages)
      ├─ Release 0.64.0
      ├─ Release 0.55.0
      ├─ Release 0.45.0
      ├─ Release 0.41.0
      ├─ Release 0.36.1
      ├─ Release 0.36.0
      ├─ Release 0.28.0
      └─ Release 0.24.0

Benefits

• Better Navigation: Users can quickly jump to a specific release
• Improved Discoverability: Each release has its own URL and can be directly linked
• Cleaner Organization: Overview page provides context and highlights
• Scalability: Easy to add new releases without making the main page unwieldy
• Consistent Structure: Each release follows the same format and organization

@jpelletier1 can click here to continue refining the PR

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