gitlab-ci: make rouge style

posts: add docker-in-lxc

posts: add sendmail

config: remove location

pages: add cat and tag

post: add hello world

nav: add tags and cats

config: more customization

config: customize

gitlab-ci: parallel gem install

config: fix uri

gitlab-ci; fix encoding

Add .gitlab-ci.yml

Release 4.20.2 💎

Fix broken link in documentation

Close #2677

Fix typo

Close #2678

Bump copyright year

Update CHANGELOG and history

Refactor page meta (#2641)

* Rename include

* Add grid view test pages

* Rename `.post__meta-sep` and use CSS to add line break

* Improve collection grid archive

* Improve page grid archive

* Enable `grid`

* Don't show date icon if there is no `date` value

* Add blank line at EOF

* Add space

* Wrap date and reading time in named `span` elements

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