Help community contribute

1. [ ] Add a gitter link so people can ask questions in (promote to slack)
2. [ ] Add "how to contribute" high up on README.md
3. [ ] Add `hacktoberfest` and `google code-in` tags to help people discover tasks
4. [ ] Add a video showing the actual hardware and user-facing capabilities
5. [ ] Leverage the "first good issue" tag, or split hard tasks into tasks which are accessible to new contributors
6. [ ] Update https://archive.org/about/volunteerpositions.php

Start with README.md and review each checklist item, including the Gitter/Slack references, discovery tags, hardware video, contributor guidance, and the linked volunteer page. Done means the requested community-contribution improvements are addressed or broken into separately actionable issues, with the README and external links updated accordingly.

Written by the indexing model from the issue text.