Improve enforcement description in the code of conduct

[KirstieJane]

At the moment we only give instructions on reporting a violation, we don't give any information about what steps could be taken.

I'd like to propose - as a jumping off point:

Elizabeth DuPre as BDFL can take any action she deems appropriate for the safety of the tedana community, including but not limited to:

• facilitating a conversation between the two parties involved in the violation of the code of conduct
• requesting a contributor apologise for their behaviour
• asking a contributor or multiple contributors to enter a cooling off period that puts a time limited pause on a particular discussion topic
• asking a contributor to no longer participate in the development of tedana

Its just as starting point! Happy to iterate!

[emdupre]

I think we can close this with #151 ! We can (and should !) revisit this, though. Thanks so much for pointing this out, @KirstieJane !!