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

_sass/minimal-mistakes/_page.scss

@@ -10,10 +10,10 @@
   padding-left: 1em;
   padding-right: 1em;
   -webkit-animation: $intro-transition;
-          animation: $intro-transition;
+  animation: $intro-transition;
   max-width: 100%;
-  -webkit-animation-delay: 0.35s;
-          animation-delay: 0.35s;
+  -webkit-animation-delay: 0.15s;
+  animation-delay: 0.15s;
 
   @include breakpoint($x-large) {
     max-width: $x-large;
@@ -21,7 +21,6 @@
 }
 
 .page {
-
   @include breakpoint($large) {
     float: right;
     width: calc(100% - #{$right-sidebar-width-narrow});
@@ -68,13 +67,14 @@
 }
 
 .page__content {
-
   h2 {
     padding-bottom: 0.5em;
     border-bottom: 1px solid $border-color;
   }
 
-  p, li, dl {
+  p,
+  li,
+  dl {
     font-size: 1em;
   }
 
@@ -92,7 +92,6 @@
   }
 
   a:not(.btn) {
-
     &:hover {
       text-decoration: underline;
 
@@ -130,9 +129,9 @@
   margin-bottom: 2em;
   @include clearfix;
   -webkit-animation: $intro-transition;
-          animation: $intro-transition;
+  animation: $intro-transition;
   -webkit-animation-delay: 0.25s;
-          animation-delay: 0.25s;
+  animation-delay: 0.25s;
 
   &--overlay {
     position: relative;
@@ -143,9 +142,9 @@
     background-repeat: no-repeat;
     background-position: center;
     -webkit-animation: $intro-transition;
-            animation: $intro-transition;
+    animation: $intro-transition;
     -webkit-animation-delay: 0.25s;
-            animation-delay: 0.25s;
+    animation-delay: 0.25s;
 
     a {
       color: #fff;
@@ -242,7 +241,6 @@
   text-transform: uppercase;
 }
 
-
 /*
    Page meta
    ========================================================================== */
@@ -268,7 +266,6 @@
   text-transform: uppercase;
 }
 
-
 /*
    Page taxonomy
    ========================================================================== */
@@ -298,7 +295,6 @@
   }
 }
 
-
 /*
    Comments
    ========================================================================== */
@@ -397,7 +393,6 @@
   }
 }
 
-
 /*
    Related
    ========================================================================== */
@@ -428,4 +423,4 @@
   margin-bottom: 10px;
   font-size: $type-size-6;
   text-transform: uppercase;
-}
+}