Bump shepherd.js from 14.5.1 to 15.0.0

package.json

@@ -112,7 +112,7 @@
     "build:pusher": "mkdir -p plugins_public/pusher; cd plugins_public/pusher; cp -r ../../node_modules/pusher-js/dist/web/* .",
     "build:quill": "mkdir -p plugins_public/quill; cd plugins_public/quill; cp -r ../../node_modules/quill/dist/* .; cp -r ../../node_modules/quill-mention/dist/* .; cp -r ../../node_modules/quill-emoji/dist/* .; cp -r ../../node_modules/quill-html-edit-button/dist/* .; cp -r ../../node_modules/quill-image-uploader/dist/quill.* .; cp -r ../../node_modules/quill-image-resize-module/image-resize.min.js .",
     "build:select2": "mkdir -p plugins_public/select2/select2-to-tree; cd plugins_public/select2; cp -r ../../node_modules/select2/dist/* .; cp -r ../../node_modules/select2-to-tree/src/* select2-to-tree",
-    "build:shepherd": "mkdir -p plugins_public/shepherd/js; mkdir -p plugins_public/shepherd/css; cp node_modules/shepherd.js/dist/css/shepherd.css plugins_public/shepherd/css; rollup node_modules/shepherd.js/dist/esm/shepherd.mjs --file=plugins_public/shepherd/js/shepherd.js --format iife -n ShephBundle --footer \"Shepherd = ShephBundle.default\"; uglifyjs plugins_public/shepherd/js/shepherd.js -c -m > plugins_public/shepherd/js/shepherd.min.js",
+    "build:shepherd": "mkdir -p plugins_public/shepherd/js; mkdir -p plugins_public/shepherd/css; cp node_modules/shepherd.js/dist/css/shepherd.css plugins_public/shepherd/css; rollup node_modules/shepherd.js/dist/js/shepherd.mjs --file=plugins_public/shepherd/js/shepherd.js --format iife -n ShephBundle --footer \"Shepherd = ShephBundle.default\"; uglifyjs plugins_public/shepherd/js/shepherd.js -c -m > plugins_public/shepherd/js/shepherd.min.js",
     "build:skrollr": "mkdir -p plugins_public/skrollr; cd plugins_public/skrollr; cp -r ../../node_modules/skrollr/dist/* .",
     "build:spin.js": "mkdir -p plugins_public/spin.js; cd plugins_public/spin.js; cp -r ../../node_modules/spin.js/spin.* .; grep -v 'export { Spinner };' spin.js > tmp && mv tmp spin.js",
     "build:stackedit.js": "mkdir -p plugins_public/stackedit.js; cd plugins_public/stackedit.js; cp -r ../../node_modules/stackedit-js/docs/lib/* .",