feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

_dev/css/dynamic/modal/_override.scss

@@ -0,0 +1,60 @@
+.modal-content {
+  background-clip: border-box;
+}
+
+.modal-fullscreen {
+  /* stylelint-disable */
+  padding: 0 !important; // override inline padding-right added from js
+  /* stylelint-enable */
+  .modal-dialog {
+    width: 100vw;
+    max-width: none;
+    height: 100%;
+    margin: 0;
+  }
+
+  .modal-content {
+    height: 100%;
+    border: 0;
+    @include border-radius(0);
+  }
+
+  .modal-body {
+    overflow-y: auto;
+  }
+}
+
+.modal .modal-dialog-aside {
+  width: 100%;
+  height: 100%;
+  margin: 0;
+  transition: transform 0.2s;
+  transform: translate(0);
+  @include media-breakpoint-up(sm) {
+    max-width: 320px;
+  }
+}
+
+.modal .modal-dialog-aside .modal-content {
+  height: inherit;
+  border: 0;
+  border-radius: 0;
+}
+
+.modal .modal-dialog-aside .modal-content .modal-body {
+  overflow-y: auto;
+}
+
+.modal.fixed-right .modal-dialog-aside {
+  margin-left: auto;
+  transform: translateX(100%);
+}
+
+.modal.fixed-left .modal-dialog-aside {
+  margin-right: auto;
+  transform: translateX(-100%);
+}
+
+.modal.show .modal-dialog-aside {
+  transform: translateX(0);
+}