Add a page title and description to the Join page (/join)

[geetxnshgoyal]

Problem

app/join/page.tsx has no metadata of its own.

Why

app/join/page.tsx is a client component ("use client"), so it can't export metadata. The browser tab and search results fall back to the site-wide title, so it's indistinguishable from the home page in a row of tabs or in Google.

Done when

• Add app/join/layout.tsx (a server component that just returns children) exporting metadata with a specific title and a one-sentence description. Follow the pattern in app/learn/open-source/page.tsx.
• Also set alternates: { canonical: "/join" }.
• The tab title is correct on /join, and npm run build passes.

Size: ~15 lines.

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[priince0]

/assign

[github-actions]

@priince0 it's yours! 🎉

1. Fork the repo and create a branch: see CONTRIBUTING.md.
2. Open your PR from your fork into main, with Fixes #61 in the description.
3. Make sure CI (Lint, Test, Type-check & build) is green.

Can't finish it? Comment /unassign so someone else can pick it up.