Implement skip repos option

[francislavoie]

Fixes #73, specifically the first suggestion there.

I didn't actually test this. Just made the code changes. I don't super feel like playing with the build tooling right now, sorry 😅

• I updated the .editorconfig because it was misaligned with what the files in the project were actually wanting.
• Removed an orphan </div> which didn't have an opener anymore, unindented.
• Unindented a 4-space indented block of HTML.

Let me know if you want me to drop these changes, I kept them in a separate commit just in case.

---

• Add SKIP_REPOS_KEY to the prefs storage, simple string from a textarea input.
• Using .split(/[\s\n,]+/) to turn the options into an array. This allows for repos to be separated by comma, space, or newline. So something like "foo bar,,baz\n\nfoobar" turns into ["foo", "bar", "baz", "foobar"] which is pretty clean.
• Using .some to find if any of the skipped repos contain the string user + "/" + repo. So for example if the skip list has https://github.com/foo/foo, https://github.com/bar/bar, then it should return true for foo/foo and bar/bar as the user/repo and return false for baz/baz.
• Simply returns to avoid showing the UI. Following the lead of the starGazers part which does a simple return.
• Doing this as early as possible to avoid doing extra work with JSON parsing etc if it should be skipped.

Hopefully this all makes sense. Hopefully I got the HTML to look right (took a quick peek at semantic-ui docs, never used it before).

[musically-ut]

LGTM. ✨

[musically-ut]

Thanks for the PR!

I'll test it out locally, merge it, and ship it to the store soon!

[musically-ut]

Nit: Would you mind adding a small link/changelog to the Acknowledgements section in the README.md? 🙃

[francislavoie]

Thanks for merging! I can confirm it works as I was intending 😁

[musically-ut]

💫