Update example env

example.env

@@ -1,7 +1,9 @@
 # System hostname for permalinks (mandatory)
 HOSTNAME=localhost
+# HTTP varient (mandatory)
+PROTO=http
 
-# ZXDB MySQL connection URL
+# ZXDB MySQL connection URL (mandatory)
 # Example using a readonly user created by ZXDB scripts
 # CREATE ROLE 'zxdb_readonly';
 # GRANT SELECT, SHOW VIEW ON `zxdb`.* TO 'zxdb_readonly';