refactor: resturcture files so that lincensing info can be bundled properly

scss/utils/_mixins.scss

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Johannes Loher
+ * SPDX-FileCopyrightText: 2021 Gesina Schwalbe
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+@use "./colors";
+
+@mixin centered-content {
+    display: grid;
+    place-items: center;
+}
+
+@mixin mark-invalid-or-disabled-input {
+    input:invalid {
+        background-color: colors.$c-invalid-input;
+    }
+    input:disabled {
+        background-color: transparent;
+    }
+}
+
+@mixin foundry-highlight-text-shadow {
+    text-shadow: 0 0 10px var(--color-shadow-primary);
+}
+
+@mixin font-heading-upper {
+    font-family: var(--ds4-font-heading);
+    text-transform: uppercase;
+}