Update copyright

Release 4.8.0 :gem:

Fix open-ended dependency warnings

Update CHANGELOG and history

Point zh-hk to Traditional Chinese (#1389)

Update CHANGELOG and history

Update gems (#1388)

Feature: Incorporate site search into masthead (#1383)

* Integrate search into masthead
* Fix cutoff descenders in archive article titles
* Remove search page from `/test` site
* Enable masthead search
* Remove dedicated search page
* Fix masthead search form padding
* Improve insertion of search content
* Speed up page transition
* Add fade transition to search content
* Rename visibility class names
* Add `site.search` to _config.yml
* Document site search feature
* Update CHANGELOG and history

Update CHANGELOG and history

Update CHANGELOG and history

Remove extra spaces

Tooltips for masthead links (#1380)

Capitalised the name "tracy tram" > "Tracy Tram" (#1375)

Simple grammar mistake. Yes, i took the time to read this haha

Simplify `search: true` conditionals

Replace `unless` tags with `where_exp` to test if `search: false`.

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

Document how to exclude pages/posts from search index

ref #1369

Add option to search in specific collections (#1369)

Update CHANGELOG and history

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

Update CHANGELOG and history