Fix material.scss colors and remove import-variables in library less

less/_import.less

@@ -1,5 +1,3 @@
-@import (reference) "~src/assets/openaire-theme/less/_import-variables";
-
 @import "general";
 @import "user";
 @import "landing";

library-css/material.scss

@@ -1,16 +1,12 @@
 @import '../../../../node_modules/@angular/material/theming';
 @include mat-core();
 $primary-color: (
-        0: var(--primary-color),
-        contrast: (
-                50: var(--contrast-color)
-        )
+        0: #211F7E,
+        contrast: (50: #ffffff)
 );
 $secondary-color: (
-        0: var(--secondary-color),
-        contrast: (
-                50: var(--contrast-color)
-        )
+        0: #3086ED,
+        contrast: (50: #ffffff)
 );
 $my-app-primary: mat-palette($primary-color, 0);
 $my-app-accent:  mat-palette($secondary-color, 0);