feat: setup tab, letter crumbs, console words

get/ pages join the tab of the setup pages of the same name, so no page is excluded from every tab and the tabs keep their names. Groups filing emulators by first letter are no crumb. A console page carries "<name> BIOS" in its terms field. The search gate runs the console, checker, schema, license and iOS queries.

website/src/routeData.ts

@@ -1,7 +1,8 @@
 // What each page knows of its place in the site, computed once per page
 // from what scripts/sitestarlight.py writes beside the sidebar:
 // - breadcrumbs: the tab and the groups above the page, each linked to the
-//   page or the section that introduces it, never to a sibling page;
+//   page or the section that introduces it, never to a sibling page. A
+//   group of names by their first letter (A, B) is no crumb;
 // - previous and next: the reading order of `reading`. Start here runs on
 //   into Your setup, every other tab is read on its own, and a system,
 //   emulator or platform page has none;
@@ -19,7 +20,7 @@ import sidebar from './generated/sidebar.json' with { type: 'json' };
 
 type Entry = StarlightRouteData['sidebar'][number];
 type Link = Extract<Entry, { type: 'link' }>;
-type Group = { href: string | null; prune: boolean };
+type Group = { href: string | null; prune: boolean; crumb?: boolean };
 export type Crumb = { label: string; href?: string };
 
 const BASE = import.meta.env.BASE_URL.replace(/\/?$/, '/');
@@ -55,7 +56,11 @@ const trail = (entries: Entry[], labels: string[]): Crumb[] | undefined => {
 		const here = [...labels, entry.label];
 		const below = trail(entry.entries, here);
 		if (below) {
-			const href = groupOf(here)?.href;
+			const group = groupOf(here);
+			// A group of names by their first letter is a way through the
+			// list, not a place: the crumb stops at the list.
+			if (group?.crumb === false) return below;
+			const href = group?.href;
 			return [{ label: entry.label, href: href ? withBase(href) : undefined }, ...below];
 		}
 	}