Fix some wrong less files which were breaking the UI of the apps

customize.dist/src/less/cryptpad.less

@@ -8,10 +8,6 @@
 @import "./topbar.less";
 @import "./footer.less";
 
-div#main.page-index {
-    @import "./page-index.less";
-}
-
 @toolbar-green: #5cb85c;
 
 html.cp, .cp body {

customize.dist/src/less/variables.less

@@ -87,27 +87,27 @@
 
 @toolbar-button-font: @dropdown-font;
 
-@toolbar-pad-color: @colortheme_pad-bg;
+@toolbar-pad-bg: @colortheme_pad-bg;
 @toolbar-pad-color: @colortheme_pad-color;
-@toolbar-slide-color: @colortheme_slide-bg;
+@toolbar-slide-bg: @colortheme_slide-bg;
 @toolbar-slide-color: @colortheme_slide-color;
-@toolbar-code-color: @colortheme_code-bg;
+@toolbar-code-bg: @colortheme_code-bg;
 @toolbar-code-color: @colortheme_code-color;
-@toolbar-poll-color: @colortheme_poll-bg;
+@toolbar-poll-bg: @colortheme_poll-bg;
 @toolbar-poll-color: @colortheme_poll-color;
-@toolbar-whiteboard-color: @colortheme_whiteboard-bg;
+@toolbar-whiteboard-bg: @colortheme_whiteboard-bg;
 @toolbar-whiteboard-color: @colortheme_whiteboard-color;
-@toolbar-drive-color: @colortheme_drive-bg;
+@toolbar-drive-bg: @colortheme_drive-bg;
 @toolbar-drive-color: @colortheme_drive-color;
-@toolbar-file-color: @colortheme_file-bg;
+@toolbar-file-bg: @colortheme_file-bg;
 @toolbar-file-color: @colortheme_file-color;
-@toolbar-friends-color: @colortheme_friends-bg;
+@toolbar-friends-bg: @colortheme_friends-bg;
 @toolbar-friends-color: @colortheme_friends-color;
-@toolbar-default-color: @colortheme_default-bg;
+@toolbar-default-bg: @colortheme_default-bg;
 @toolbar-default-color: @colortheme_default-color;
-@toolbar-settings-color: @colortheme_settings-bg;
+@toolbar-settings-bg: @colortheme_settings-bg;
 @toolbar-settings-color: @colortheme_settings-color;
-@toolbar-profile-color: @colortheme_profile-bg;
+@toolbar-profile-bg: @colortheme_profile-bg;
 @toolbar-profile-color: @colortheme_profile-color;