General UI Improvement (again) (#255)

* Add and fix some stuff

* Add warning when leaving to `mod/create`

* Fix mods/create not working

assets/styles/highlightjs.scss

@@ -1,10 +1,3 @@
-.hljs {
-  display: block;
-  overflow-x: auto;
-  padding: 0.5rem !important;
-  background: #F0F0F0
-}
-
 .hljs,
 .hljs-subst {
   color: #444
@@ -85,7 +78,7 @@ pre {
   border-radius: 2em;
   border-color: var(--color-brand);
   overflow-x: hidden;
-  
+
   code {
     line-height: 100%;
     padding: 0.2em;
@@ -93,4 +86,4 @@ pre {
     word-break: normal;
     font-family: monospace;
   }
-}
+}