Add maintainer expectations to the Governance page

[danielbachhuber]

See https://github.com/wp-cli/wp-cli/issues/5719

Synthesized from these meeting notes:

Alain:

• Taking care of the boring stuff (e.g. tests are passing, CI pipeline works as expected)
• Provide onboarding help, answer questions, unblock things.
• Provide direction for the project (what will and won’t be accepted as contributors)
• Market and create excitement for the project (e.g. leading Contributor Days)
• Ensure the longevity and integrity of the project
• Saying hello to users

Pascal:

• To be around for people (e.g. office hours). Helps prevent people from thinking the project is dead.
• Steering technical direction (e.g. code reviews).
• Elevating people through the contribution pipe

Daniel:

• Being the final authority on and shipping releases.
• Regular involvement (min avg 1-2 hours/week) and responsiveness (24-48 business hours)
• High level: quality and stability of the product.
• If a severe bug or regression is found, owning the delivery of a patch release.

[danielbachhuber]

@schlessera @swissspidy I did my best to synthesize our notes into concise and high-level expectations. Is there anything you'd change about or add to what I've written?

[swissspidy]

I'd say you caught the essence of it 👍

[danielbachhuber]

@schlessera Any changes you'd suggest?

[schlessera]

@danielbachhuber LGTM.