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/Components/Icon.css

@@ -1,5 +1,5 @@
 .danger {
-  color: $dangerColor;
+  color: var(--dangerColor);
 }
 
 .default {
@@ -7,25 +7,33 @@
 }
 
 .disabled {
-  color: $disabledColor;
+  color: var(--disabledColor);
 }
 
 .info {
-  color: $infoColor;
+  color: var(--infoColor);
+
+  &:global(.darken) {
+    color: color(var(--infoColor) shade(30%));
+  }
 }
 
 .pink {
-  color: $pink;
+  color: var(--pink);
+
+  &:global(.darken) {
+    color: color(var(--pink) shade(30%));
+  }
 }
 
 .success {
-  color: $successColor;
+  color: var(--successColor);
 }
 
 .warning {
-  color: $warningColor;
+  color: var(--warningColor);
 }
 
 .purple {
-  color: $purple;
+  color: var(--purple);
 }