Start exposing Ghost on localhost and template port

no ref

- The thinking here is this allows users to more easily run multiple Ghost instances on the same server by templating the Ghost port
- Majority wont need this but it also simplifies the message around having to forward traffic if you don't start Caddy

.env.example

@@ -13,6 +13,11 @@ DATABASE_ROOT_PASSWORD=reallysecurerootpassword
 DATABASE_USER=optionalusername
 DATABASE_PASSWORD=ghostpassword
 
+# Port Ghost should listen on
+# You should only need to edit this if you want to host
+# multiple sites on the same server
+# GHOST_PORT=2368
+
 # Developer Experiences must be enabled for
 # both Traffic Analytics and ActivityPub
 ENABLE_DEVELOPER_EXPERIMENTS=false