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

test/_config.yml

@@ -49,6 +49,7 @@ staticman:
         format           : "iso8601" # "iso8601" (default), "timestamp-seconds", "timestamp-milliseconds"
 atom_feed:
   path                   : # blank (default) uses feed.xml
+search                   : true # true, false (default)
 
 # SEO Related
 google_site_verification :

test/_data/navigation.yml

@@ -2,8 +2,6 @@
 main:
   - title: "Quick-Start Guide"
     url: https://mmistakes.github.io/minimal-mistakes/docs/quick-start-guide/
-  - title: "Search"
-    url: /search/
   - title: "About"
     url: https://mmistakes.github.io/minimal-mistakes/about/
   - title: "Sample Posts"

test/_pages/search.md

@@ -1,5 +0,0 @@
----
-layout: search
-title: "Search"
-permalink: /search/
----