Remove unused style variable

Author: Frederic Collonval

style/variables.css

@@ -3,23 +3,13 @@
 | Distributed under the terms of the Modified BSD License.
 |----------------------------------------------------------------------------*/
 
-@import url('https://fonts.googleapis.com/css?family=Oswald');
-
 :root {
   --jp-icon-discard-file-selected: url('./images/discard-selected.svg');
-  --jp-Git-icon-author: url('./images/author.svg');
-  --jp-image-caretdownwhite: url('./images/caretdownwhite.svg');
-  --jp-caret-right-white: url('./images/caretrightwhite.svg');
   --jp-icon-move-file-down-hover: url('./images/move-file-down-hover.svg');
   --jp-icon-move-file-up-hover: url('./images/move-file-up-hover.svg');
-  --jp-icon-path-arrow-right: url('./images/path-arrow-right.svg');
   --jp-checkmark: url('./images/checkmark-icon.svg');
   --jp-icon-clear-white: url('./images/clear-white.svg');
-  --jp-icon-git: url('./images/git-icon.svg');
   --jp-icon-git-clone: url('./images/git-clone-icon.svg');
-  --jp-icon-git-clone-disabled: url('./images/git-clone-icon-disabled.svg');
-  --jp-icon-git-push-disabled: url('./images/git-clone-icon-disabled.svg');
-  --jp-icon-git-pull-disabled: url('./images/git-clone-icon-disabled.svg');
   --jp-git-diff-deleted-color: rgba(255, 0, 0, 0.2);
   --jp-git-diff-added-color: rgba(155, 185, 85, 0.2);
   --jp-git-diff-output-color: rgba(0, 141, 255, 0.3);