docs: partial fixes DOC-1263

[addetz]

Describe the Change

This PR fixes the following bugs with the PartialsComponent:

• Adjusts the partial generation script to work with nested folders.
• Ignores partials for prettier formatting.
• Fixes mistake with VersionedLink README.
• Adds limitation of PartialsComponent around headings in the TOC.

Changed Pages

No user-facing changes.

Jira Tickets

🎫 DOC-1263

Backports

Can this PR be backported?

• [x] Yes. Remember to add the relevant backport labels to your PR.
• [ ] No. Please leave a short comment below about why this PR cannot be backported.

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[addetz]

Nested partials testing steps

1. Checkout the latest version of the feature branch.

   git checkout partial-fixes-doc-1263 && git pull

2. Create a nested partial. For example, add folder _partials/nested and add a new mdx file with category example-cat-nested and name example-name-nested.
3. Add the following snippet to any existing markdown page.

   <PartialsComponent category="example-cat-nested" name="example-name-nested" message="Hello Nested!" />

4. Run make start. Navigate to the previously modified page and ensure that the example partial displays correctly with the following text:

   This is an example partial with an example property. Hello Nested!

5. Open scripts/versions.sh and comment out L48-L54 & L124. This will stop pulling the latest changes on the version branch and enable us to run tests on versioning locally.
6. Kill the local server. Commit the changes you've made to this branch with a temporary commit.
7. Checkout any version branch

   git checkout version-4-3 && git pull

8. Cherrypick the fix from the branch into the version branch.

   git cherry-pick 1760b631d4b980ba8f6605ff923c6dd6b29adad14

9. Make any change to the nested partial you created previously.

   We are in version-4-3. This is an example partial with an example property. {props.message}

10. Add the following snippet to any existing markdown page.

    <PartialsComponent category="example-cat-nested" name="example-name-nested" message="Hello from version 4.3.x!" />

11. Commit the changes you've made to this branch with a temporary commit.
12. Run make start. Navigate to the previously modified page and ensure that the example partial displays correctly with the following text:

    We are in version-4-3. This is an example partial with an example property. Hello!

13. Kill the local server. Return to the feature branch

    git checkout partial-fixes-doc-1263

14. Run make versions to create the versioned files.
15. Run make start. Navigate to the pages modified in the feature branch and the version branch and ensure that the versioned partials text is displayed.
16. Once you are done, clean versions and discard any temp commits in your branches

    make clean-versions

    git checkout version-4-3 && git reset origin/version-4-3 --hard

    git checkout partial-fixes-doc-1263 && git reset origin/partial-fixes-doc-1263 --hard

[vault-token-factory-spectrocloud[bot]]

💚 All backports created successfully

Status	Branch	Result
✅	version-4-0
✅	version-3-4
✅	version-4-1
✅	version-4-2
✅	version-4-3
✅	version-4-4

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details