Merge branch 'master' of https://github.com/mmistakes/minimal-mistakes

* 'master' of https://github.com/mmistakes/minimal-mistakes:
  Add guide on applying Front Matter defaults to jekyll-archives pages (#2466)

Add guide on applying Front Matter defaults to jekyll-archives pages (#2466)

* Add guide on applying Front Matter defaults to jekyll-archives pages

Sources:
- https://github.com/mmistakes/minimal-mistakes/issues/2465#issuecomment-604839346
- https://github.com/iBug/iBug-source/commit/8685c1ecd984529dcb044ba816497313d8896f1e

* Update CHANGELOG and history

Update .gitignore (#2366)

Show a permalink anchor when hovering over headings in main content (#2251)

* Implement heading permalinks, close #2246

Thanks to jekyll/jekyll for CSS.
Link anchor is visible when the mouse hovers over the title line.

* Build the updated _main.js

Ignore Jekyll cache

Merge branch 'release/4.0.4'

Conflicts:
	README.md

Merge branch 'feature/theme-gem' into develop

Update files and directories ignored by Git

Revert "Update files and directories ignored by Git"

This reverts commit 145c097375f8e0b4052df7d08205bc6c101836a2.

Update files and directories ignored by Git

Merge branch 'release/3.0.0'

Merge branch 'feature/documentation-and-demo' into develop

Ignore node .log files

Ignore node .log files

Ignore node .log files

Merge branch 'feature/refactor-tasks' into develop

Alphabetize

Support Jekyll 3.0
- Update to Jekyll v3.0
- Switch from Pygments.rb to Rouge for syntax highlighting
- Minor updates to syntax.scss partial and theme documentation
- Include jekyll-gist gem
- Close #192, #218

Update gems

Ignore