Privacy proxy updates

[danish-m-qureshi]

Summary

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Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
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[Copilot]

Pull request overview

Updates Privacy Proxy and Privacy Gateway documentation, including new/expanded authentication guidance and a major rewrite of Privacy Gateway metrics reference content.

Changes:

• Updates Privacy Proxy authentication documentation to add mTLS alongside PSK and Privacy Pass.
• Rewrites Privacy Gateway metrics reference to document available GraphQL nodes, fields, and sample queries using Details.
• Removes alternating-row shading CSS for markdown tables.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/styles/table.css	Removes global markdown-table alternating row shading rule.
src/content/docs/privacy-proxy/concepts/authentication.mdx	Adds mTLS authentication section and updates the authentication methods table.
src/content/docs/privacy-gateway/reference/metrics.mdx	Major expansion/restructure of Privacy Gateway GraphQL metrics documentation and examples.

Comments suppressed due to low confidence (1)

src/styles/table.css:22

• This change removes the global alternating-row shading rule for markdown tables. Since this affects table readability site-wide (not just Privacy Proxy/Privacy Gateway docs), consider either scoping the style change more narrowly or adding context (for example, a replacement style or rationale) so it’s clear this regression/visual change is intentional.

	padding-inline-end: 1rem;
}

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