Remove unused backend-only env vars

Author: brandonkachen

.env.example

@@ -6,13 +6,11 @@ OPENAI_API_KEY=dummy_openai_key
 # Database & Server
 DATABASE_URL=postgresql://manicode_user_local:secretpassword_local@localhost:5432/manicode_db_local
 PORT=4242
-GOOGLE_CLOUD_PROJECT_ID=dummy_project_id
 
 # Authentication
 CODEBUFF_GITHUB_ID=dummy_github_id
 CODEBUFF_GITHUB_SECRET=dummy_github_secret
 NEXTAUTH_SECRET=dummy_nextauth_secret_at_least_32_chars_long
-API_KEY_ENCRYPTION_SECRET=dummy_encryption_secret_32_chars
 
 # Payment (Stripe)
 STRIPE_SECRET_KEY=sk_test_dummy_stripe_secret
@@ -21,7 +19,6 @@ STRIPE_USAGE_PRICE_ID=price_dummy_usage_id
 STRIPE_TEAM_FEE_PRICE_ID=price_dummy_team_fee_id
 
 # External Services
-RELACE_API_KEY=dummy_relace_key
 LINKUP_API_KEY=dummy_linkup_key
 LOOPS_API_KEY=dummy_loops_key