feat: add contributors page to website (#928)

* Initial plan

* feat: add contributors page to website

Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

* feat: add footer with contributors link and fix emoji-only display

- Add custom Starlight Footer component with 'Made with ❤️ by our
  amazing contributors' linking to /contributors/
- Filter out contribution types without emoji mappings in the
  contributor data generation so only emojis (🎭🎁🧭⌨️🧰) are
  shown on the contributors page, not text labels like 'code' or 'doc'

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* feat: use all-contributors HTML output for contributors page

- Restyle all-contributors generated table as a responsive card grid
  using CSS grid on tbody with card-styled td cells
- Remove old custom JS search/filter UI and contributors.ts script
- Remove generateContributorsData from data pipeline (no longer needed)
- Keep all-contributors markers for bot regeneration
- Include updated contributor data from .all-contributorsrc

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: CSS fixes for contributors page Starlight compatibility

- Override Starlight table width/overflow to prevent clipping
- Force td width: 100% to counteract HTML width="14.28%" attribute
- Set emoji links to display: inline to prevent vertical stacking
- Improve border visibility with lighter gray color

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>
Co-authored-by: Aaron Powell <me@aaron-powell.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

website/src/components/Footer.astro

@@ -0,0 +1,30 @@
+---
+import type { Props } from '@astrojs/starlight/props';
+import Default from '@astrojs/starlight/components/Footer.astro';
+---
+
+<Default {...Astro.props}><slot /></Default>
+
+<div class="made-by">
+  <p>Made with ❤️ by our amazing <a href="/contributors/">contributors</a></p>
+</div>
+
+<style>
+  .made-by {
+    text-align: center;
+    padding: 1rem 0 1.5rem;
+    font-size: var(--sl-text-xs);
+    color: var(--sl-color-gray-3);
+  }
+
+  .made-by a {
+    color: var(--sl-color-gray-3);
+    text-decoration: underline;
+    text-underline-offset: 0.15em;
+    transition: color 0.2s ease;
+  }
+
+  .made-by a:hover {
+    color: var(--sl-color-accent);
+  }
+</style>