Move the canonical repo to Gitea; GitHub becomes a private archive

git.karti.ai/PIG/PIG-Demo is now the source of truth, public and anonymously
cloneable. Every self-link in the site and the docs repoints there — Gitea
serves file paths at /src/branch/main/, not /blob/main/, so those needed
rewriting rather than a hostname swap.

CI moves with it. An archived GitHub repo is read-only and its Actions stop
firing, so leaving the workflow there would have meant a repo whose gates
silently never run. .github/ is deleted rather than kept for reference: a
workflow that can never execute is worse than no workflow, because it looks
like coverage.

The Gitea workflow is not a copy. That runner is aarch64 and installs pnpm
through corepack from `packageManager` rather than pnpm/action-setup, uses
checkout@v4 and setup-node@v4, and fetches uv from astral.sh directly. It is
also configured `container.network: host` — nothing here needs a service
container, but the comment says so, because that setting cost the sibling repo
three failed runs.

The header and footer icon changed from the GitHub mark to a neutral one. A
GitHub logo pointing at a Gitea instance is a small lie about where the code
lives, on a site whose argument is that you can go and check it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019mt6sHQHEnEYrJZvoMCJSB

index.html

@@ -29,10 +29,10 @@
         <h1 style="font-size:1.5rem;margin-bottom:1rem">PIG Demo</h1>
         <p>These demos are interactive and need JavaScript. The substance behind them does not.</p>
         <p>Every demo on this site ships a real <a href="https://github.com/PrimeIntellect-ai/verifiers">verifiers</a> environment and a set of recorded rollouts, both in the repository. You can run the environment yourself:</p>
-        <pre style="background:#f4f4f5;padding:1rem;border-radius:.5rem;overflow-x:auto"><code>git clone https://github.com/karti-ai/PIG-Demo
+        <pre style="background:#f4f4f5;padding:1rem;border-radius:.5rem;overflow-x:auto"><code>git clone https://git.karti.ai/PIG/PIG-Demo
 cd PIG-Demo &amp;&amp; uv sync --all-packages
 uv run vf-eval wordle-five -n 8</code></pre>
-        <p><a href="https://github.com/karti-ai/PIG-Demo">Read the source on GitHub →</a></p>
+        <p><a href="https://git.karti.ai/PIG/PIG-Demo">Read the source →</a></p>
       </main>
     </noscript>
     <script type="module" src="/src/main.tsx"></script>