Upgraded to stable version of VuePress 1

Also had to update some styles that had disappeard somewhere.

Author: Sandstedt

docs/.vuepress/styles/index.styl

@@ -23,6 +23,8 @@ html, body {
   .navbar {
     background-color: $navbarBg;
     border: none;
+    position: sticky;
+    top: 0;
     .links {
       background-color: transparent;
     }
@@ -32,6 +34,12 @@ html, body {
     background-color: $sidebarBg;
   }
 
+  .content__default {
+    max-width: 60em; 
+    margin: 0 auto;
+    padding: 0 4%;
+  }
+
   // Custom blocks
   .custom-block {
     background-color $c-purple-light