Bump Jekyll gem dependency to `v3.7`

Regression for mmistakes#2332 (#2385)

* Regression for mmistakes#2332

There's already a `relative_url` in place, shouldn't stack up another

* Update CHANGELOG and history

Release 4.18.1 💎

Fix compatibility issue with paginate V2 introduced by mmistakes/minimal-mistakes#2378 (#2381)

Release 4.18.0 💎

Update CHANGELOG and history

Allow using theme without pagination (#2378)

Add links to high resolution skin screenshots

Resolves #2363

Update CHANGELOG and history

Adjust comments to be compatible with compress_html (#2373)

Update CHANGELOG and history

Fix wrong newline concatenation in SEO description, resolves #2354 (#2368)

Close #2354 

Update CHANGELOG and history

Update README and LICENSE (#2367)

* Update README and LICENSE

* README: Replace RawGit with jsDelivr

Update CHANGELOG and history

Update .gitignore (#2366)

Update CHANGELOG and history

Allow override of page excerpt in heading (via tagline) (#2307)

Allow the use of `page.tagline` to override `page.excerpt` in heading area

Update CHANGELOG and history

🔧 Exclude `package-lock.json` (#2364)