Update CSS file extensions to SCSS

src/inject/documentload.css

@@ -1,18 +0,0 @@
-/* // This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>. */
-
-html {
-  background: #161616 !important;
-  background-color: #161616;
-  font-family: Rubik, Roboto !important;
-}