Add gitea and a generic container role

docs/general.md

@@ -3,6 +3,10 @@ These variables are required by multiple roles. Example values included.
 
 ```
 timezone: 'Europe/Helsinki'
+admin_email: 'admin@domain.tld'
+
+smtp_server: smtp.domain.tld
+smtp_from: sender@domain.tld
 ```
 
 # Optional variables