Add categories for docs template

web-app/src/routes/(authenticated)/website/[websiteId]/collaborators/+page.svelte

@@ -12,6 +12,7 @@
 
 <WebsiteEditor
   id={data.website.id}
+  contentType={data.website.content_type}
   title={data.website.title}
   previewContent={data.home.main_content}
 >
@@ -35,7 +36,14 @@
       >
         <label>
           User id:
-          <input type="text" name="user-id" minlength="36" maxlength="36" required />
+          <input
+            type="text"
+            name="user-id"
+            minlength="36"
+            maxlength="36"
+            placeholder="00000000-0000-0000-0000-000000000000"
+            required
+          />
         </label>
 
         <label>