Add links to shields (facebook#1831)

README.md

@@ -4,8 +4,15 @@
 
 <p align="center">
   <img alt="GitHub Workflow Status" src="https://img.shields.io/github/workflow/status/facebook/lexical/Lexical%20Tests">
-  <img alt="npm" src="https://img.shields.io/npm/v/lexical"> <img alt="Discord" src="https://img.shields.io/discord/953974421008293909">
-  <img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/lexicaljs?style=social">
+  <a href="https://www.npmjs.com/package/lexical">
+    <img alt="Visit the NPM page" src="https://img.shields.io/npm/v/lexical"> 
+  </a>
+  <a href="https://discord.gg/KmG4wQnnD9">
+    <img alt="Add yourself to our Discord" src="https://img.shields.io/discord/953974421008293909">
+  </a>
+  <a href="https://twitter.com/intent/follow?screen_name=lexicaljs">
+    <img alt="Follow us on Twitter" src="https://img.shields.io/twitter/follow/lexicaljs?style=social">
+  </a>
 </p>
 
 **⚠️ Lexical is currently in early development and APIs and packages are likely to change quite often.**