Extend and clean up the extension section

[BoHristova]

How to categorize this PR?

/kind enhancement cleanup

What this PR does / why we need it:

This PR brings the List of Extensions section of the documentation up to date with the Known Extension Implementations list maintained in gardener/gardener.

Еxtensions added:

Infrastructure providers

• KubeVirt the extension isn't actively maintained anymore
• vSphere (had to be excluded from the current PR because unescaped angle brackets in the source docs were causing a build error; will be added in a different PR after the problem is fixed) the extension is not maintained anymore

Operating system

• Debian/Ubuntu – metal-stack

Others

• Audit
• Cloudflare DNS
• csi-driver-lvm
• Envoy Gateway
• Falco Service
• Flux
• Image Rewriter
• OIDC Apps Controller
• PowerDNS
• S3 Compatible Storage

Sidebar improvements

• Renamed section "List of Extensions" → "Extensions"
• Removed redundant category words from sidebar labels (e.g. "OS", "CNI", "Provider") to keep labels concise
• Updated sidebar labels to align more closely with upstream implementation names (e.g. "Falco" → "Falco Service", "Node Audit Logging" → "Rsyslog RELP")
• Added weight frontmatter to all Others entries to enforce consistent alphabetical order

Which issue(s) this PR fixes:
Related to #1023

Special notes for your reviewer:

Summary by CodeRabbit

Documentation

• Improved extension documentation navigation with clearer, more consistent section, provider, and page titles.
• Reordered documentation entries and added weights for predictable page placement.
• Added documentation entries for additional infrastructure, operating system, and community extensions.
• Updated network and container runtime page titles for consistency.
• Added file-tree links to selected operating system documentation pages.

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[gardener-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Team

Run ID: 0c059901-e1d0-4aa1-a2b4-6b85afd3085b

📥 Commits

Reviewing files that changed from the base of the PR and between 7664c21 and 3a3ca69.

⛔ Files ignored due to path filters (1)

• hugo/content/docs/extensions/others/acl-extension.md is excluded by !hugo/content/**

📒 Files selected for processing (7)

• .docforge/documentation/documentation.yaml
• .docforge/documentation/gardener-extensions/container-runtime.yaml
• .docforge/documentation/gardener-extensions/gardener-extensions.yaml
• .docforge/documentation/gardener-extensions/infrastructure.yaml
• .docforge/documentation/gardener-extensions/network.yaml
• .docforge/documentation/gardener-extensions/operating-system.yaml
• .docforge/documentation/gardener-extensions/others.yaml

🚧 Files skipped from review as they are similar to previous changes (6)

• .docforge/documentation/gardener-extensions/network.yaml
• .docforge/documentation/gardener-extensions/container-runtime.yaml
• .docforge/documentation/gardener-extensions/gardener-extensions.yaml
• .docforge/documentation/documentation.yaml
• .docforge/documentation/gardener-extensions/operating-system.yaml
• .docforge/documentation/gardener-extensions/others.yaml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The documentation configuration updates navigation titles, extension ordering, provider and extension names, numeric weights, and Gardener extension entries.

Changes

Documentation catalog

Layer / File(s)	Summary
Category navigation titles .docforge/documentation/documentation.yaml, .docforge/documentation/gardener-extensions/gardener-extensions.yaml, .docforge/documentation/gardener-extensions/container-runtime.yaml	Top-level and extension category titles were shortened. The gVisor page title was changed to gVisor.
Infrastructure, operating system, and network indexes .docforge/documentation/gardener-extensions/infrastructure.yaml, .docforge/documentation/gardener-extensions/operating-system.yaml, .docforge/documentation/gardener-extensions/network.yaml	Entries were reordered and assigned numeric weights. Provider, operating system, and network titles were simplified. A metal-stack operating system entry was added. File-tree links were added to two operating system entries.
Additional extension entries .docforge/documentation/gardener-extensions/others.yaml	The index was reordered and expanded with new extensions. Existing titles were renamed and assigned numeric weights.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 3a3ca

This PR updates extension documentation and sidebar naming without changing product behavior or runtime systems; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: n-boshnakov, dimitar-kostadinov

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main changes: extending and cleaning up the documentation Extensions section.
Description check	✅ Passed	The description includes the PR category, purpose, detailed changes, related issue, and reviewer context. The issue is marked as related rather than using the template's exact “Fixes #” format, but th…

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (7 skipped: 7 unsupported.)

Full details: Description check

Explanation

The description includes the PR category, purpose, detailed changes, related issue, and reviewer context. The issue is marked as related rather than using the template's exact “Fixes #” format, but the required context is present.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Sitemap structure diff vs master

	count
➕ added pages	0
➖ removed pages	0

First entries (full diff in the run summary & artifact):

ADDED   (0):
  (none)
REMOVED (0):
  (none)

A rename appears as one removed (old path) + one added (new path).

[BoHristova]

The build is failing because there are unescaped angle brackets in one of the pulled documents for the vSphere extension: https://github.com/gardener-attic/gardener-extension-provider-vsphere/blob/642bbe1c04fb7e2f9f767cad5b87c42b16057af8/docs/usage/prepare-vsphere.md?plain=1#L237.

I'll remove the extension from the current PR and add it as soon as the problem is fixed in the source repository.

[coderabbitai]

Note

GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer.

[BoHristova]

Blocked by #1071

[marc1404]

Blocked by #1071

@BoHristova, I'll convert the PR to a draft and put it on hold until the issue is resolved, since the changes aren't visible in the Netlify preview deployment.

/hold