feat: Update documentation on configuring Babel, removing the section…

… on passing '{"modules": false}' as that is no longer needed since Babel 7. Closes #3717

docs/07-tools.md

@@ -166,14 +166,12 @@ Before Babel will actually compile your code, it needs to be configured. Create
 ```json
 {
   "presets": [
-    ["@babel/env", {"modules": false}]
+    "@babel/env"
   ]
 }
 ```
 
-There are a few unusual elements to this setup. First, we're setting "modules": false, otherwise Babel will convert our modules to CommonJS before Rollup gets a chance to do its thing, causing it to fail.
-
-Secondly, we're putting our `.babelrc.json` file in `src`, rather than the project root. This allows us to have a different `.babelrc.json` for things like tests, if we need that later – See the [Babel documentation](https://babeljs.io/docs/en/config-files#project-wide-configuration) for more information on both project wide and file relative configuration. 
+We're putting our `.babelrc.json` file in `src`, rather than the project root. This allows us to have a different `.babelrc.json` for things like tests, if we need that later – See the [Babel documentation](https://babeljs.io/docs/en/config-files#project-wide-configuration) for more information on both project wide and file relative configuration. 
 
 Now, before we run rollup, we need to install
 [`babel-core`](https://babeljs.io/docs/en/babel-core)