docs: Add building extensions guide - #438

Process completed with exit code 1.

Error: Found 7 broken link(s): docs/src/content/docs/guide/building-extensions.md:121 - Link to "../concepts/skills.md" does not exist (text: "Skills") docs/src/content/docs/guide/building-extensions.md:122 - Link to "../concepts/ceremonies.md" does not exist (text: "Ceremonies") docs/src/content/docs/guide/extensibility.md:116 - Link to "./../concepts/plugin-marketplace.md" does not exist (text: "Plugin Marketplace docs") docs/src/content/docs/guide/extensibility.md:133 - Link to "./../concepts/plugin-marketplace.md" does not exist (text: "Plugin Marketplace") docs/src/content/docs/guide/extensibility.md:134 - Link to "./../concepts/skills.md" does not exist (text: "Skills") docs/src/content/docs/guide/extensibility.md:135 - Link to "./../concepts/ceremonies.md" does not exist (text: "Ceremonies") docs/src/content/docs/guide/extensibility.md:136 - Link to "./../concepts/routing.md" does not exist (text: "Routing") ❯ test/docs-links.test.ts:178:15

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-node@v4. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/