IDEA: Parameterize the mail function in order to simplify the email

Currently the email function is hardcoded to your email address and the corresponding community (Auth0 in this case). This should be parameterized down to the subject, etc. for any community

https://github.com/konradsopala/discourse-community-leaderboard/blob/14e9cbaf5dde5028d7c444684ec5be39f746b977/Script/leaderboard.py#L92