feat: support autodiscovery

[Jmainguy]

Added support for autodiscovery of repos from a list of organizations and users.

Changed configuration from env variables to a flat yaml file.

Updated readme to support new changes.

Changed how the output looks, added emojis.

[coveralls]

Pull Request Test Coverage Report for Build 8409097299

Details

• 2 of 243 (0.82%) changed or added relevant lines in 5 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-46.4%) to 17.273%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
helper.go	0	23	0.0%
main.go	0	44	0.0%
config.go	0	85	0.0%
repos.go	0	89	0.0%

Files with Coverage Reduction	New Missed Lines	%
main.go	1	0.0%
helper.go	4	23.81%

Totals
Change from base Build 8239615741:	-46.4%
Covered Lines:	57
Relevant Lines:	330

---

💛 - Coveralls