feat: new color system

frontend/app/src/theme/colors.scss

@@ -13,7 +13,7 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 @import './util/color-system';
-
+/*
 @include ion-color(primary, #3880ff);
 @include ion-color(secondary, #32db64);
 @include ion-color(tertiary, #f4a942);
@@ -26,6 +26,7 @@
 
 @include ion-background-color(#f5f5f5, #000);
 @include ion-item-color(#fff, #0e0e0e);
+*/
 
 :root {
   --calender-lecture-card: var(--ion-color-primary-tint);