feat(brand): use real AnHonestHost wordmark + chevron logo

- Pulled the real inline SVG from anhonesthost.com (chevrons + wordmark
  with 'Host' in teal #00d4aa)
- Override Starlight's SiteTitle component so the SVG is inlined rather
  than loaded as <img>, letting currentColor follow the active theme
- Hub page header uses the same wordmark
- 'Knowledge Base' label sits to the right of the brand mark, hidden on
  narrow viewports

astro.config.mjs

@@ -18,11 +18,12 @@ export default defineConfig({
   },
   integrations: [
     starlight({
-      title: 'An Honest Host KB',
-      description: 'Customer documentation for WHP and other An Honest Host services.',
-      logo: {
-        src: './src/assets/logo.svg',
-        replacesTitle: false,
+      title: 'AnHonestHost KB',
+      description: 'Customer documentation for WHP and other AnHonestHost services.',
+      components: {
+        // Inline-SVG brand mark + "Knowledge Base" label.
+        // Inlining lets the SVG's currentColor follow the active theme.
+        SiteTitle: './src/components/SiteTitle.astro',
       },
       customCss: [
         '@fontsource-variable/inter',