Rename index.md to index.md:metamask

[mkenshin1688-collab]

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• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

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Note

Renames the Services docs landing page file to a MetaMask-specific variant without content changes.

• Moves/renames services/index.md to services/index.md:metamask (content remains the Services introduction with networks and APIs sections)

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