docs: update README

README.md

@@ -4,15 +4,15 @@
 [![Netlify Status](https://api.netlify.com/api/v1/badges/e682ebfd-e62e-4a58-a194-edac472f7f12/deploy-status)](https://app.netlify.com/sites/wizardly-minsky-4657d5/deploys)
 [![Dependencies](https://david-dm.org/davidballester/grapher.svg)](https://david-dm.org/davidballester/grapher.svg)
 
-# [Grapher](https://wizardly-minsky-4657d5.netlify.com/)
+# [Grapher](https://grapher.tech/)
 
 Grapher is a graph editor. It's that simple!
 
-[![grapher](assets/grapher-readme.png)](https://wizardly-minsky-4657d5.netlify.com/)
+[![grapher](assets/grapher-readme.png)](https://grapher.tech/)
 
 Visit it now at:
 
-[https://wizardly-minsky-4657d5.netlify.com/](https://wizardly-minsky-4657d5.netlify.com/)
+[https://grapher.tech/](https://grapher.tech/)
 
 ## Setup
 
@@ -46,6 +46,10 @@ Graphs are stored in your [browser's local storage](https://developer.mozilla.or
 
 You can download a JSON version of your graph that you can then use to import the graph again into grapher. Use that feature as backup method.
 
+## Firebase
+
+You can log in with your Google account and store your graphs in the cloud to have them available everywhere!
+
 ---
 
 <small>This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).</small>