Add styles for tom-select and nouislider to libs.json

preview/pages/_data/libs.json

@@ -31,7 +31,9 @@
     "dropzone": "dropzone/dist/dropzone.css",
     "plyr": "plyr/dist/plyr.css",
     "star-rating.js": "star-rating.js/dist/star-rating.min.css",
-    "coloris.js": "@melloware/coloris/dist/coloris.min.css"
+    "coloris.js": "@melloware/coloris/dist/coloris.min.css",
+    "tom-select": "tom-select/dist/css/tom-select.bootstrap5.min.css",
+    "nouislider": "nouislider/dist/nouislider.min.css"
   },
   "js-copy": {
     "tinymce" :"tinymce/*"