Offboard Staff Member Elizabeth Barron

- [x] Remove from [staff team](https://github.com/orgs/InnerSourceCommons/teams/staff).
- [x] Remove from [#innersource-marketing-team](https://app.slack.com/client/T04PXKRM0/C05KNQT26RK).
- [x] Remove from [#flax-and-teal-isc](https://app.slack.com/client/T04PXKRM0/C04K4K6362C).
- [x] Remove from weekly staff meeting.
- [ ] Decommission `@innersourcecommons.org` email.
