Add new overview landing page setting (#39074)

app/javascript/mastodon/actions/server.ts

@@ -16,19 +16,33 @@ export const fetchServer = createDataLoadingThunk(
       dispatch(importFetchedAccount(instance.contact.account));
     }
   },
+  {
+    condition: (_, { getState }) => !getState().server.server.isLoading,
+  },
 );
 
 export const fetchExtendedDescription = createDataLoadingThunk(
   'server/extended_description',
   () => apiGetExtendedDescription(),
+  {
+    condition: (_, { getState }) =>
+      !getState().server.extendedDescription.isLoading,
+  },
 );
 
 export const fetchServerTranslationLanguages = createDataLoadingThunk(
   'server/translation_languages',
   () => apiGetTranslationLanguages(),
+  {
+    condition: (_, { getState }) =>
+      !getState().server.translationLanguages.isLoading,
+  },
 );
 
 export const fetchDomainBlocks = createDataLoadingThunk(
   'server/domain_blocks',
   () => apiGetDomainBlocks(),
+  {
+    condition: (_, { getState }) => !getState().server.domainBlocks.isLoading,
+  },
 );