docs: updated the Redux URL (ngxs#1785)

* Updated the Redux URL

Updated the Redux URL back to the Chrome store. The URL "http://extension.remotedev.io/" redirects users to NSFW and explicit sites.

* Fixed URL Link

Fixed typo

* Added Firefox Link

Added separate Firefox link

docs/plugins/devtools.md

@@ -1,6 +1,10 @@
 # Redux Devtools
 
-Plugin with integration with the [Redux Devtools extension](http://extension.remotedev.io/).
+Plugin with integration:
+
+- [Chrome - Redux Devtools](https://chrome.google.com/webstore/detail/redux-devtools/lmhkpmbekcpmknklioeibfkpmmfibljd)
+- [Firefox - Redux Devtools](https://addons.mozilla.org/en-US/firefox/addon/reduxdevtools/)
+
 
 ![Devtools Screenshot](../assets/devtools.png)