Add mailing list information

Added information about when the CUADC mailing lists are sent, along with contact email addresses. I'm currently having trouble getting my local version to display properly in my browser, so have only been able to try these changes by downloading and editing the html pages currently in use on the live version of V2.

Additionally, I think it would be best to wait until I've told all the relevant committee members I'm doing this (if only to check I've got the days right!), which I will do on Sunday.