[feature request] tracker rules handling

[utkonostracker]

Currently user can register and get all download privilegies without accepting tracker rules and even without reading rules at all.

Please consider:

1. Adding checkbox on /register page with text like "I agree to the website rules".
   Checkbox should be disabled by default and registration process should require from user to manually activate it.
   "website rules" phrase should be active link to /wiki/rules/ page opening in a new tab.
2. Adding the creation of /wiki/rules/ page (and setting it to public access) as a part of initial db migration for setting new instance.

I guess this would fit registration flow of nearly all public & private trackers.