update color definitions

zero.Web.UI/Sass/Modules/Buttons/_button.scss

@@ -36,8 +36,8 @@ button::-moz-focus-inner
   display: inline-flex;
   justify-content: space-between;
   align-items: center;
-  color: var(--color-primary-fg);
-  background: var(--color-primary);
+  color: var(--color-secondary-fg);
+  background: var(--color-secondary);
   padding: 0 20px;
   height: 42px;
   border-radius: 3px;

zero.Web.UI/Sass/Modules/_flatpickr.scss

@@ -140,11 +140,11 @@
   &.selected
   {
     font-weight: 700;
-    color: var(--color-primary-fg);
+    color: var(--color-secondary-fg);
 
     &:after
     {
-      background: var(--color-primary);
+      background: var(--color-secondary);
     }
   }
 

zero.Web.UI/Sass/Modules/_link.scss

@@ -2,6 +2,6 @@
 
 .ui-link
 {
-  color: var(--color-primary);
+  color: var(--color-secondary);
   text-decoration: underline dotted;
 }