Add documentation for SanitizeEmail

[williamleven]

SanitizeEmail in util.go will have to be changed as more strange nicks show up. Make sure to document where to find it and how to edit it

[Portals]

Would it not be wiser to extract this into a json file for easier editing? @williamleven

[williamleven]

Would it not be wiser to extract this into a json file for easier editing? @williamleven

You have a point, or just add it to the config