How to - feature driven documentation fior RRTs

Write a how-to (https://james.apache.org/howTo/index.html) for RRTs:

• How to configure... RRT storage + RRT mailet

Here is a short list of feature to present:

• I want to rewrite the domains of some incoming emails - domain alias
• I want to have user aliases
• I want to have groups - virtual addresses being rewritten to a user list
• I want to set up forwards
• I want to set up a wildcard redirection

For all these use cases we will present a sample webadmin query.