Remove Arch-specific styles for the MonoBook skin

It was already disabled on the Arch wiki, there is no reason to keep it:
archlinux/infrastructure!817

extensions/ArchLinux/modules/arch_common.less

@@ -91,10 +91,7 @@ body {
 #wikiPreview > div.mw-content-rtl a {
     font-weight: bold;
 }
-#bodyContent #toc a,
-#bodyContent .special li > a,
-#bodyContent .special li span a,
-#bodyContent #pagehistory a {
+#bodyContent #toc a {
     font-weight: normal;
 }
 
@@ -104,7 +101,6 @@ header.mw-header li:not(.new), // Vector
 #mw-panel-toc,                // Vector
 #mw-navigation li:not(.new),  // Legacy Vector
 #mw-panel li:not(.new),       // Legacy Vector
-#column-one li:not(.new),     // MonoBook
 #footer {
   a:not([role=button]) {
     &:not(.new) {
@@ -129,8 +125,6 @@ header.mw-header li:not(.new), // Vector
  * (not for MediaWiki navigation elements above the page) */
 #content,
 #mw-panel li:not(.new),       // Legacy Vector
-#p-navigation li:not(.new),   // MonoBook
-#p-tb li:not(.new)            // MonoBook
 {
   a:not(.new):not([role=button]):visited {
     color: @link-color-visited !important;

extensions/ArchLinux/modules/skins/monobook.less

-@import '../arch_definitions';
-
-h1 {
-    font-weight: bold;
-}
-
-/* bump down the personal toolbar (top menu) */
-#p-personal {
-    top: 5px;
-}
-
-/* bump down the action tabs (page, discuss, edit, etc.) */
-#p-cactions {
-    top: 27px;
-}
-
-/* bump down the main content to make room for navbar */
-#content {
-    top: 10px;
-}
-
-/* use the same color for the border of all tabs */
-#p-cactions {
-    li, li.selected {
-        border: @content-border-style;
-    }
-}
-
-/* shrink the content just enough to show off the borders */
-div#globalWrapper {
-    width: 99%;
-    background-image: none !important;
-}
-
-/* disable default mediawiki logo and close the gap it leaves behind */
-#p-logo {
-    display: none !important;
-}
-div#column-one {
-    padding-top: 36px;
-}
-
-/* clean up the footer */
-div#footer {
-    background-color: transparent;
-    border-top: none;
-    border-bottom: none;
-    /* bring footer text inline with content */
-    margin-left: 12.2em;
-    padding: 0em 1em;
-    ul {
-        margin-left: 0;
-    }
-}