docs(docs): fix 404 on v3 config-migration page from v4 upgrade guide#2429
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The link from /v4-0-0-snapshot/upgrading/2x-to-3x/ to the v3 Config Directory Migration page 404'd because the file was named 3.0.0-config-migration.md and Astro's slug generator strips dots entirely rather than converting them to dashes, producing the unintuitive URL /v3-0-0/upgrading/300-config-migration/. PR #2181 introduced the link assuming dots-to-dashes — that assumption was incorrect. - Rename file to 3-0-0-config-migration.md so the URL matches every other doc filename in the tree and the existing link works as written. - Add redirect from /300-config-migration/ to preserve any external bookmarks accumulated while the dotted-slug URL was live. - Add a sidebar entry under INTRODUCTION > Upgrading; the page was orphaned from v3-0-0.json entirely. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
The link in v4-0-0-snapshot/upgrading/2x-to-3x.mdx pointing at
/v3-0-0/upgrading/3-0-0-config-migration/returns 404. Reported via Slack.Root cause: The target file was named
3.0.0-config-migration.md— the only dotted filename in the entire docs tree. Astro/Starlight's slug generator strips dots entirely rather than converting them to dashes, producing the unintuitive live URL/v3-0-0/upgrading/300-config-migration/. PR #2181 introduced the link assuming dots-to-dashes — that assumption was wrong.Changes
3.0.0-config-migration.md→3-0-0-config-migration.mdso the URL matches every other doc filename in the tree (verified viagit mvto preserve history). The existing link in2x-to-3x.mdxalready uses dashes and now resolves correctly./v3-0-0/upgrading/300-config-migration/→/v3-0-0/upgrading/3-0-0-config-migration/inastro.config.mjsto preserve any external bookmarks to the dots-stripped slug while it was live.src/sidebars/v3-0-0.jsonentirely — added as a child underINTRODUCTION > Upgradingusing the existinglink + itemsidiom (rendered as a collapsible group with "Overview" + the new entry bynormalizeIteminastro.config.mjs).Test plan
/v3-0-0/upgrading/3-0-0-config-migration/returns 200/v3-0-0/upgrading/300-config-migration/redirects to the new URL/v4-0-0-snapshot/upgrading/2x-to-3x/no longer 404s🤖 Generated with Claude Code