B2B-88: add starter kit structure and elements

.env.production

@@ -0,0 +1,12 @@
+# PRODUCTION ENVIRONMENT VARIABLES
+
+## DO NOT ADD VARS HERE UNLESS THEY ARE PUBLIC OR NOT SENSITIVE
+## THIS ENV IS USED FOR PRODUCTION AND IS COMMITED TO THE REPO
+## AVOID PLACING SENSITIVE DATA IN THIS FILE.
+## PUBLIC KEYS OR CONFIGURATION ARE OKAY TO BE PLACED HERE.
+
+# SUPABASE
+NEXT_PUBLIC_SUPABASE_URL=
+
+# STRIPE
+NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=