Update Vercel redirects for maintenance and 404 pages

[rohitpaulk]

Note

High Risk
Site-wide traffic routing change that effectively takes the entire frontend offline for users until reverted; misconfiguration or wrong destination URL would block all access.

Overview
Turns on maintenance mode for the Vercel frontend by adding a first redirect rule that sends all paths (/(.*)) to a static maintenance page at https://buildyourownx.com/heroku_pages/maintenance.html with a temporary (non-permanent) redirect.

Because this rule is ordered before existing redirects (404 guards, / → /catalog, backend proxy paths, etc.), every request should hit the maintenance page until the rule is removed—matching the repo’s maintenance-mode workflow of placing the catch-all at the top of redirects.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[codecov]

Bundle Report

Changes will increase total bundle size by 1.64kB (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
client-array-push	39.17MB	1.64kB (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/chunk.*.js	1.56kB	3.44MB	0.05%
assets/chunk.*.js	82 bytes	41.61kB	0.2%