Revert some breaking packages

package.json

@@ -4,6 +4,7 @@
   "description": "A beautiful interface for creating Nginx endpoints",
   "main": "src/backend/index.js",
   "devDependencies": {
+    "@babel/core": "^7.7.4",
     "babel-core": "^6.26.3",
     "babel-loader": "^8.0.6",
     "babel-minify-webpack-plugin": "^0.3.1",
@@ -12,6 +13,7 @@
     "backbone.marionette": "^4.1.2",
     "copy-webpack-plugin": "^5.0.5",
     "css-loader": "^3.2.0",
+    "ejs-lint": "^0.3.0",
     "ejs-loader": "^0.3.5",
     "file-loader": "^5.0.2",
     "imports-loader": "^0.8.0",
@@ -42,7 +44,7 @@
     "compression": "^1.7.4",
     "config": "^3.2.4",
     "diskdb": "^0.1.17",
-    "ejs": "^3.0.1",
+    "ejs": "^2.6.1",
     "express": "^4.17.1",
     "express-fileupload": "^1.1.6",
     "gravatar": "^1.8.0",
@@ -50,7 +52,7 @@
     "json-schema-ref-parser": "^7.1.2",
     "jsonwebtoken": "^8.5.1",
     "knex": "^0.20.3",
-    "liquidjs": "^9.4.2",
+    "liquidjs": "^5.1.1",
     "lodash": "^4.17.15",
     "moment": "^2.24.0",
     "mysql": "^2.17.1",