chore: remove sd

apps/docs/components.ts

@@ -16,8 +16,5 @@ export default defineComponents({
   layout: {
     // Topic landing pages' "what links here": every problem pointing at the page.
     PageFooter: "./components/BacklinksList.astro",
-    // Content-source selector + pinned links above the nav tree, scoped to the
-    // active source (sources.ts).
-    Sidebar: "./components/SourceSidebar.astro",
   },
 });