Make responsive (#8)

* Refactor ModResult to use CSS Grid

* Mobile support for ModResult

* Mobile navbar

* Mobile fixes, get rid of x overflow

* Mobile filter support

* Fully responsive

* Collapse categories view later

* Mobile-first

* Fix version selector width

assets/styles/layout.scss

@@ -1,7 +1,7 @@
 .columns {
   display: flex;
 
-  @for $i from 1 through 4 {
+  @for $i from 1 through 5 {
     .column-grow-#{$i} {
       flex-grow: $i;
     }