Add procedure for resigning and removal of members

[ehashman]

Okay, so this is not a very fun topic, but it's pretty important. Obviously, this hasn't come up yet, but I think it's important to have a procedure to replace committee members (people should be able to resign) and to remove members.

Some possible scenarios in which removing a member would be appropriate:

• Absenteeism (doesn't attend any meetings or respond to email)
• Performs some unauthorized action on behalf of the committee resulting in significant damage to the committee's reputation
• Serious violation of committee values in conduct or actions which, while not a violation of the CoC, would constitute a case for removal

Note that I listed Code of Conduct violations separately, as a CoC violation may be serious enough to instate a permanent ban on an individual from serving on the committee. In the case they are removed through this procedure, they are free to return to the committee in the future.

[fboxwala]

besides my comments, ++to this section.

@wics-uw/contributors anything to add?

[evykassirer]

++ thanks for including this

[ehashman]

@fboxwala is this good to merge now?

[fboxwala]

lgtm