feat(oauth): Add option to logout from OpenID Connect provider

* Fixes #598

Signed-off-by: Marvin A. Ruder <signed@mruder.dev>

frontend/src/services/auth.service.ts

@@ -29,8 +29,10 @@ const signUp = async (email: string, username: string, password: string) => {
 };
 
 const signOut = async () => {
-  await api.post("/auth/signOut");
-  window.location.reload();
+  const response = await api.post("/auth/signOut");
+
+  if (URL.canParse(response.data?.redirectURI)) window.location.href = response.data.redirectURI;
+  else window.location.reload();
 };
 
 const refreshAccessToken = async () => {