feat: update .env.example

.env.example

@@ -1,19 +1,10 @@
-#-----------------------System Config------------------------------#
-SYSTEM_QUESTION_LINK=https://github.com/canyon-project/canyon
-
-#-----------------------Backend Config------------------------------#
 # Prisma Config
 DATABASE_URL=postgress://canyon:canyon@localhost:5432/canyon
 
 # Gitlab Config
 GITLAB_URL="***"
 GITLAB_CLIENT_ID="***"
 GITLAB_CLIENT_SECRET="***"
-COVERAGE_DATA_URL=http://s3.xxx
 REDIRECT_URI=http://localhost:3000/login
 
-APP_URI=http://localhost:3000
-UPLOAD_URL=http://localhost:3000
-
-
 PRIVATE_TOKEN=***