Add live release version + Discord member badges to landing page

[Aaronontheweb]

Summary

Adds two live-fetched badges to the landing page:

• Latest release → pulls the latest non-prerelease tag from the GitHub Releases API
• Discord members → pulls the approximate member count from the Discord invite endpoint

Each badge is rendered as a styled .stat-pill (rounded chip, dark theme, JetBrains Mono numeric, teal accent) and ships in two locations:

• Hero — below the GitHub / Get Started CTA buttons, above the "Built by the team behind Akka.NET" line
• Community section — under the "Join the community" heading, above the social tiles

How it works

Browser-side fetch() on page load. Each pill ships with the hidden attribute and is revealed only on a successful response — a failed fetch leaves the pill hidden (no zeros, no broken numbers, no error UI). min-height on the row wrappers reserves vertical space so the pills appearing doesn't cause layout shift.

GitHub:  https://api.github.com/repos/netclaw-dev/netclaw/releases/latest
         → tag_name → "v0.19.0"
Discord: https://discord.com/api/v9/invites/ayqrChDtNs?with_counts=true
         → approximate_member_count → 41

Both endpoints confirmed to send CORS headers.

Known trade-offs

• GitHub unauthenticated API limit is 60 req/hr/IP. A heavily NAT-shared visitor IP could hit it; the pill stays hidden in that case.
• Numbers reflect the moment the page loaded, not the deploy time — that's deliberate (always-live).
• Discord member count is currently 41. Small but honest; the pill scales with the server.

Test plan

• npm run build passes (112 pages).
• Previewed locally over Tailscale — both pills populate within ~500ms of page load on both placements.

Diff

One file touched: src/pages/index.astro. Adds ~30 lines of CSS, ~14 lines of hero markup, ~14 lines of community markup, ~30 lines of JS in the existing inline <script> block.