pl-fe: migrate /api/v*/instance to tanstack query

Signed-off-by: mkljczk <git@mkljczk.pl>

packages/pl-fe/src/utils/auth.ts

@@ -56,10 +56,6 @@ const getAuthUserUrl = (state: RootState) => {
   ].filter(url => url).find(isURL);
 };
 
-/** Get the VAPID public key. */
-const getVapidKey = (state: RootState) =>
-  state.auth.app?.vapid_key || state.instance.configuration.vapid.public_key;
-
 const getMeUrl = (state: RootState) => selectOwnAccount(state)?.url;
 
 export {
@@ -71,6 +67,5 @@ export {
   getAccessToken,
   getAuthUserId,
   getAuthUserUrl,
-  getVapidKey,
   getMeUrl,
 };