New: Darkmode

* New: Native Theme Engine

Co-Authored-By: Zak Saunders <thezak48@users.noreply.github.com>
(cherry picked from commit 2291f3e00eb2ff9268a0b2f49da8dde82ee13c04)

* Update CSS for themes

* Fixup CSS values

* Fixup remove duped Color-Impaired setting

* Fixup Link Colors

Co-Authored-By: Qstick <qstick@gmail.com>

frontend/src/Author/Index/Table/AuthorIndexRow.css

@@ -31,7 +31,7 @@
   position: relative;
   display: block;
   height: 70px;
-  background-color: $defaultColor;
+  background-color: var(--defaultColor);
 }
 
 .bannerImage {
@@ -49,7 +49,7 @@
   padding: 5px;
   width: 100%;
   height: 100%;
-  color: $offWhite;
+  color: var(--offWhite);
   text-align: center;
   font-size: 20px;
 }
@@ -92,7 +92,7 @@
 }
 
 .ratings {
-  composes: headerCell from '~Components/Table/VirtualTableHeaderCell.css';
+  composes: cell from '~Components/Table/Cells/VirtualTableRowCell.css';
 
   flex: 0 0 80px;
 }