various small fixes

- light theme footer css
- fixed l/r overlay css
- fixed discolored generics
- fixed scroll margin
- elements selected by url now display as hovered
- fixed top padding in mobile layout
- fixed padding for import string on type pages
- fixed padding on module listing pages
- fixed link clickable areas on left nav

src/styles/docs/nav/nav-tree.css

@@ -82,10 +82,6 @@ html.dark .nav-shevron {
     &>a {
       width: 100%;
       margin-left: 0.2rem;
-
-      &:hover {
-        text-decoration: none;
-      }
     }
   }