Replacing global themed sass-vars to css-vars (#4322)

* generating css-vars
* convert all global / theme sass vars to css vars with available default theme colors
* added missing colors to dark lens theme

src/renderer/components/chart/chart.scss

@@ -35,7 +35,7 @@
       white-space: normal;
 
       &:hover {
-        background: $colorVague;
+        background: var(--colorVague);
         cursor: default;
       }
     }