Make Augur Easy to Install Again!

Changelog

- Refactor add-github-org implementation
- Add ability to create repo groups from GitHub orgs using the Augur CLI
- Fixed a few documentation links and avoided using the word 'here' as a link
- Add sudo warning to installation docs
- Hide password during config setup process
- Update installation logging for clarity
- Update default config file location
- Update augur util kill usage
- Add augur util stop
- Revert "updating augur util kill cli_kill_processes and kill_processes to send SIGKILL after waiting 15 seconds"
- Remove duplicated and outdated doc pages
- Update Travis CI build to install all worker deps
- Add tag_only releases to the release worker