Update .env.example

Added Supabase variables.

Author: antman1p

.env.example

@@ -1,6 +1,10 @@
 # Cache Configs
 CACHE_STORE=database # Defaults to database. Other available cache store: redis and filesystem
-REDIS_URL= # Redis URL - could be a local redis instance or cloud hosted redis. Also support rediss:// urls
+REDIS_URL= # Redis URL - could be a local redis instance or cloud hosted redis. Also support rediss:// URLs
+
+# Supabase Configuration
+SUPABASE_URL=
+SUPABASE_ANON_KEY=
 
 # Discord Configuration
 DISCORD_APPLICATION_ID=