Apply theme colors to "breadcrumb" elements

I'm going to be using these on the Docs site, may be good to implement
on the main site itself at some point (possibly in the wiki?).

tildes/scss/themes/_theme_base.scss

@@ -112,6 +112,28 @@
     }
   }
 
+  .breadcrumb .breadcrumb-item {
+    color: map-get($theme, "foreground-secondary");
+
+    &:not(:last-child) {
+      a {
+        color: map-get($theme, "foreground-secondary");
+      }
+    }
+
+    &:not(:first-child) {
+      &::before {
+        color: map-get($theme, "foreground-secondary");
+      }
+    }
+
+    &:last-child {
+      a {
+        color: map-get($theme, "link");
+      }
+    }
+  }
+
   .btn {
     color: map-get($theme, "button");
     background-color: transparent;