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

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

packages/pl-fe/src/hooks/use-instance.ts

@@ -1,6 +0,0 @@
-import { useAppSelector } from './use-app-selector';
-
-/** Get the Instance for the current backend. */
-const useInstance = () => useAppSelector((state) => state.instance);
-
-export { useInstance };