Chore: Upgraded to angular 15

Chore: Moved from angular/flex-layout to Tailwind
Chore: Upgrade completed

overlord/src/app/purchase/purchase.component.css

@@ -31,10 +31,6 @@
   top: 0;
 }
 
-mat-form-field.mat-form-field {
-  font-size: 1.25em;
-}
-
 .gold {
   color: gold;
 }
@@ -42,3 +38,9 @@ mat-form-field.mat-form-field {
 .pointer {
   cursor: pointer;
 }
+
+.fill-remaining-space {
+  /* This fills the remaining space, by using flexbox.
+     Every toolbar row uses a flexbox row layout. */
+  flex: 1 1 auto;
+}