feat(ojoi-web): Categories page (#16762)

* Moved adverts query to server side, added ui for main categories on the front page.

* Updated client, added sub categories.

* Set tag url to search

* Malaflokkar page is now ready and functioning properly.

* Removed console logs

* Fixed PR comments.

* Moved nested href property to a calculated value

* Sorted imports

* Simplified logic and updated from Link to LinkV2

---------

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/web/components/OfficialJournalOfIceland/OJOIUtils.ts

@@ -91,3 +91,31 @@ export const formatDate = (date?: string, df = 'dd.MM.yyyy') => {
     throw new Error(`Could not format date: ${date}`)
   }
 }
+
+export const getStringArrayFromQueryString = (
+  value?: string | string[],
+): string[] => {
+  if (!value) {
+    return []
+  }
+
+  if (Array.isArray(value)) {
+    return value
+  }
+
+  return value.split(',')
+}
+
+export const getStringFromQueryString = (
+  value?: string | string[],
+): string | undefined => {
+  if (!value) {
+    return undefined
+  }
+
+  if (Array.isArray(value)) {
+    return value[0]
+  }
+
+  return value
+}