revert peer dependencies bump, remove configLoader (#1600)

* Revert bumping peer-dependencies version
* Remove deprecated configLoader

CHANGELOG.md

@@ -15,14 +15,9 @@ Please follow the recommendations outlined at [keepachangelog.com](http://keepac
 ### [Unreleased]
 Changes since the last non-beta release.
 
-#### Changed
-- Bump minimum version of peer dependencies as following [PR 1596](https://github.com/shakacode/react_on_rails/pull/1596) by [ahangarha](https://github.com/ahangarha).
-  - `js-yaml` to `4.1.0`
-  - `react` and `react-dom` to `17.0.0`
-
 #### Removed
 - Dropped Ruby 2.7 support [PR 1595](https://github.com/shakacode/react_on_rails/pull/1595) by [ahangarha](https://github.com/ahangarha).
-- Dropped support for Node 14 and 17 [PR 1596](https://github.com/shakacode/react_on_rails/pull/1596) by [ahangarha](https://github.com/ahangarha).
+- Removed deprecated `webpackConfigLoader.js` [PR 1600](https://github.com/shakacode/react_on_rails/pull/1600) by [ahangarha](https://github.com/ahangarha).
 
 ### [13.4.1]
 #### Fixed

docs/javascript/troubleshooting-when-using-webpacker.md

@@ -43,30 +43,7 @@ At the same time dev/prod environments works fine (with extra webpack calling st
 
 ### webpack.config.js
 
-```js
-...
-const ManifestPlugin = require('webpack-manifest-plugin');
-...
-const { output } = webpackConfigLoader(configPath);
-...
-  output: {
-    filename: '[name]-[hash].js',
-
-    // Leading and trailing slashes ARE necessary.
-    publicPath: output.publicPath,
-    path: output.path,
-  },
-...
-  plugins: [
-    ...
-    new ManifestPlugin({
-      publicPath: output.publicPath,
-      writeToFileEmit: true
-    }),
-   ...
-  ]
-...
-```
+See [Shakapcker Webpack Configuration](https://github.com/shakacode/shakapacker/blob/master/README.md#webpack-configuration).
 
 ### config/webpacker.yml
 

package.json

@@ -50,13 +50,12 @@
     "@babel/runtime-corejs3": "^7.12.5"
   },
   "peerDependencies": {
-    "js-yaml": ">= 4.1.0",
-    "react": ">= 17",
-    "react-dom": ">= 17"
+    "js-yaml": ">= 3.0.0",
+    "react": ">= 16",
+    "react-dom": ">= 16"
   },
   "files": [
-    "node_package/lib",
-    "webpackConfigLoader.js"
+    "node_package/lib"
   ],
   "scripts": {
     "test": "jest node_package/tests",