refactor(search): do not add stack overflow types on the default page

Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/search/src/alpha.tsx

@@ -69,25 +69,6 @@ import { SearchType } from './components/SearchType';
 import { UrlUpdater } from './components/SearchPage/SearchPage';
 import { convertLegacyRouteRef } from '@backstage/core-plugin-api/alpha';
 
-/** @internal */
-const StackOverflowIcon = () => {
-  return (
-    <svg
-      viewBox="0 0 125 125"
-      width="25"
-      height="25"
-      fill="none"
-      xmlns="http://www.w3.org/2000/svg"
-    >
-      <path d="M84.021 75.825v31H11v-31H0v42h95v-42H84.021z" fill="#BCBBBB" />
-      <path
-        d="M21.057 96.825H74v-10H21.057v10zm1.058-23.915l51.428 10.794 2.117-10.265L24.23 62.645 22.115 72.91zm6.773-24.656l47.618 22.222 4.445-9.524L33.33 38.73l-4.444 9.524zm13.227-23.386l40.423 33.65 6.773-8.042-40.53-33.65-6.666 8.042zM68.147 0L59.68 6.243l31.323 42.222 8.465-6.243L68.147 0z"
-        fill="#F48024"
-      />
-    </svg>
-  );
-};
-
 /** @alpha */
 export const SearchApi = createApiExtension({
   factory: {
@@ -172,11 +153,6 @@ export const SearchPage = createPageExtension({
                         name: 'Architecture Decision Records',
                         icon: <DocsIcon />,
                       },
-                      {
-                        value: 'stack-overflow',
-                        name: 'Stack Overflow',
-                        icon: <StackOverflowIcon />,
-                      },
                     ]}
                   />
                   <Paper className={classes.filters}>