Add redirects for 18 legacy doc paths still returning 404

[danstotts-ops]

What

GSC's 'Not found (404)' validation on the runpod.io domain property failed (July 3 email); a chunk of the still-404 URLs are legacy docs paths from old structures: /graphql/*, /category/*, /docs/*, and pre-restructure serverless paths. Several carry external backlinks (/graphql/manage-pods has 11 referring pages).

Change

Adds 18 entries to the redirects array in docs.json, each mapped to the closest current page. All destination paths verified to exist (as .mdx or live 200). No content changes.

After this deploys, re-request validation in GSC for the 'Not found (404)' issue.

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Project	Status	Preview	Updated (UTC)
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[danstotts-ops]

@lavanya-gunreddi one more approval click needed, sorry. The merge was blocked by the required 'Check tooltip imports' status check: its workflow is path-filtered to .mdx files, so on this json-only PR it never ran and the merge sat waiting forever. I pushed a whitespace-only touch to one .mdx to trigger it (it passed in 9s), but that push reset your approval. No content changed since your review beyond that whitespace line. Once re-approved this merges immediately.

Separately, worth fixing the root cause so this doesn't bite the next docs.json-only PR: either remove the paths filter from validate-tooltips.yml (the script is a 9-second no-op when nothing relevant changed) or drop it from the required checks list.