Removed error for stylesheets.

docs/en/stylesheets/extra.css

@@ -0,0 +1,5 @@
+[dir="ltr"] .md-typeset blockquote {
+    border-left: .2rem solid rgba(68, 138, 255, 1);
+    background-color: rgba(34, 44, 63, 1);
+    color: rgb(240, 240, 240);
+}

docs/nl/javascripts/mathjax.js

@@ -0,0 +1,16 @@
+window.MathJax = {
+    tex: {
+      inlineMath: [["\\(", "\\)"]],
+      displayMath: [["\\[", "\\]"]],
+      processEscapes: true,
+      processEnvironments: true
+    },
+    options: {
+      ignoreHtmlClass: ".*|",
+      processHtmlClass: "arithmatex"
+    }
+  };
+  
+  document$.subscribe(() => { 
+    MathJax.typesetPromise()
+  })