fix(env): remove unused keys (#60878)

api/src/app.ts

@@ -201,7 +201,6 @@ export const build = async (
     // TODO(Post-MVP): add the redirectIfSignedIn hook here, rather than in the
     // mobileAuth0Routes and authRoutes plugins.
     await fastify.register(publicRoutes.mobileAuth0Routes);
-    // TODO: consolidate with LOCAL_MOCK_AUTH
     if (FCC_ENABLE_DEV_LOGIN_MODE) {
       await fastify.register(publicRoutes.devAuthRoutes);
     } else {

sample.env

@@ -58,12 +58,6 @@ CURRICULUM_LOCALE=english
 # Show or hide WIP in progress challenges
 SHOW_UPCOMING_CHANGES=false
 
-# ---------------------
-# Debugging Mode Keys - these should not be used in production
-# ---------------------
-PEER=stuff
-LOCAL_MOCK_AUTH=true
-
 # ---------------------
 # New API
 # ---------------------