docs(development): add react devtools page

docs/development/react-devtools.md

@@ -0,0 +1,19 @@
+---
+title: React Developer Tools
+description: Installing and using React Developer Tools in Spotify.
+---
+
+To install React Developer Tools in Spotify:
+
+1. Launch Spotify in the developer mode (and with the `--enable-chrome-runtime` flag if you are using **Spotify older than 1.2.34**; without it React Developer Tools won't work)
+2. Press *Ctrl + Shift + T*
+3. Press *Ctrl + N*
+4. Navigate to the React Developer Tools page on Chrome Web Store using the address bar: `https://chromewebstore.google.com/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi`
+5. Press the "Add to Chrome" button
+6. Confirm your choice
+
+You may need to press *F5* to get the extension working.
+
+If you get an error saying that you're not allowed to install extensions, try using this switch: `--allowlisted-extension-id=fmkadmapgofadopljbjfkapdkoienihi`.
+
+You can find more info about React Developer Tools on the [official React website](https://react.dev/learn/react-developer-tools).

sidebars.js

@@ -49,6 +49,7 @@ const sidebars = {
         'development/themes',
         'development/custom-apps',
         'development/js-modules',
+        'development/react-devtools',
         'development/spotify-cli-flags',
         {
           type: 'category',