added docker and VPS documentation

- Create run-onionr-node.sh to parse env and supply args to run-onionr-node.py
- Dockerfile:
  - Run onionr by default rather than bash
  - Run as unprivileged user by default instead of root
  - Use /app for all code
  - Specify python 3.7 (3.8 fails to build cffi)
  - Use apt-get rather than apt (apt's CLI is not stable)
  - Slight reformatting and consolidation
  - do not use devnull in run-onionr-node.py

Bumps [pdoc3](https://github.com/pdoc3/pdoc) from 0.9.1 to 0.9.2.
- [Release notes](https://github.com/pdoc3/pdoc/releases)
- [Changelog](https://github.com/pdoc3/pdoc/blob/master/CHANGELOG)
- [Commits](https://github.com/pdoc3/pdoc/compare/0.9.1...0.9.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.4.0 to 5.5.0.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jazzband/pip-tools/compare/5.4.0...5.5.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump pdoc3 from 0.9.1 to 0.9.2

Bumps [pdoc3](https://github.com/pdoc3/pdoc) from 0.9.1 to 0.9.2.
- [Release notes](https://github.com/pdoc3/pdoc/releases)
- [Changelog](https://github.com/pdoc3/pdoc/blob/master/CHANGELOG)
- [Commits](https://github.com/pdoc3/pdoc/compare/0.9.1...0.9.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump pip-tools from 5.4.0 to 5.5.0

* fixes #22
* When restarting from cli, always output to previous process' terminal

Install on CentOS 7