feat(search): add stackoverflow to types accordion

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

plugins/search/src/alpha.tsx

@@ -69,6 +69,25 @@ 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: {
@@ -153,6 +172,11 @@ export const SearchPage = createPageExtension({
                         name: 'Architecture Decision Records',
                         icon: <DocsIcon />,
                       },
+                      {
+                        value: 'stack-overflow',
+                        name: 'Stack Overflow',
+                        icon: <StackOverflowIcon />,
+                      },
                     ]}
                   />
                   <Paper className={classes.filters}>