fix: css scoping

Author: atymic

source/_assets/sass/_documentation.scss

@@ -1,4 +1,4 @@
-img.gh-emoji {
+.gh-emoji {
   height: 1.5em;
   vertical-align: middle;
 }

source/assets/build/css/main.css

@@ -835,7 +835,7 @@ table thead th {
   font-size: .925rem;
 }
 
-img.gh-emoji {
+.gh-emoji {
   height: 1.5em;
   vertical-align: middle;
 }

source/assets/build/mix-manifest.json

@@ -1,4 +1,4 @@
 {
     "/js/main.js": "/js/main.js?id=c538451819f81e5a3cdc",
-    "/css/main.css": "/css/main.css?id=1e754af41d0e7e80d3d1"
+    "/css/main.css": "/css/main.css?id=38ed6d71522b370fe1e8"
 }

webpack.mix.js

@@ -28,6 +28,6 @@ mix.js('source/_assets/js/main.js', 'js')
     .purgeCss({
         extensions: ['html', 'md', 'js', 'php', 'vue'],
         folders: ['source'],
-        whitelistPatterns: [/language/, /hljs/, /algolia/],
+        whitelistPatterns: [/language/, /hljs/, /algolia/, /emoji/],
     })
     .version();