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/+nodes/node-details.scss

@@ -20,8 +20,8 @@
  */
 
 .NodeDetails {
-  --status-ready-bg: #{$colorOk};
-  --status-default-bg: #{$colorError};
+  --status-ready-bg: var(--colorOk);
+  --status-default-bg: var(--colorError);
 
   .conditions {
     @include node-status-bgs;