Merge branch 'min-is-better' into 'master'

Use katex min css

See merge request gitlab-org/gitlab-ce!18061

app/assets/javascripts/behaviors/markdown/render_math.js

@@ -31,7 +31,7 @@ export default function renderMath($els) {
   if (!$els.length) return;
   Promise.all([
     import(/* webpackChunkName: 'katex' */ 'katex'),
-    import(/* webpackChunkName: 'katex' */ 'katex/dist/katex.css'),
+    import(/* webpackChunkName: 'katex' */ 'katex/dist/katex.min.css'),
   ]).then(([katex]) => {
     renderWithKaTeX($els, katex);
   }).catch(() => flash(__('An error occurred while rendering KaTeX')));

config/webpack.config.js

@@ -104,7 +104,7 @@ const config = {
         },
       },
       {
-        test: /katex.css$/,
+        test: /katex.min.css$/,
         include: /node_modules\/katex\/dist/,
         use: [
           { loader: 'style-loader' },