Update how to get involved so it's accurate

[theecrit]

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• Bug (something's broken)
• Feature request or improvement
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Description

The current About Us has some inaccuracies and unclear language and should be updated to:

Join us at Hack Night.

We meet weekly on Zoom (normally, we meet in City Hall but are working remotely during the coronavirus pandemic). Don’t be shy about joining in and introducing yourself; we’re friendly folk. RSVP on Meetup.

Thank you!

• Please document your design and tech decisions in your pull request so others can follow along and understand why we've made the decisions we have.
• If you'd like feedback, input, or help, share your thoughts or question in this issue's comments.