Add configurability for the list of ignored owners

[majakurcius]

Description

Changes proposed in this pull request:

• Add configurability for the list of ignored owners
• Update README, and fix its structure
• Fix typos

Related issue(s)

Fixes #54

[codecov]

Codecov Report

Merging #55 into master will increase coverage by 4.31%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   45.82%   50.13%   +4.31%     
==========================================
  Files          13       12       -1     
  Lines         371      375       +4     
==========================================
+ Hits          170      188      +18     
+ Misses        199      183      -16     
- Partials        2        4       +2     

Impacted Files	Coverage Δ
internal/check/valid_owner.go	29.82% <82.35%> (+19.04%)	⬆️
internal/check/valid_owner_error.go	50.00% <0.00%> (+50.00%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 97fb795...c3e71ce. Read the comment docs.

[mszostok]

As discussed f2f, the integration tests are not working on forked PRs (yet 🙏 ). This will be documented in a separate PR :)

merging 🚀