Finish restructuring files

formula10/static/style/bootstrap.scss

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+// Disable Bootstrap Grid and use CSS Grid instead
+$enable-grid-classes: false;
+$enable-cssgrid: true;
+
+@import "../../bootstrap/scss/bootstrap";

formula10/static/style/draggable.css

@@ -0,0 +1,21 @@
+/* https://codepen.io/retrofuturistic/pen/DJWYBv */
+
+[draggable] {
+  -moz-user-select: none;
+  -khtml-user-select: none;
+  -webkit-user-select: none;
+  user-select: none;
+
+  /* Required to make elements draggable in old WebKit */
+  -khtml-user-drag: element;
+  -webkit-user-drag: element;
+}
+
+.column {
+  cursor: move;
+}
+
+.column.over {
+  //border: 2px dashed #000;
+  border-top: 2px solid blue;
+}