Add retirement note (#1342)

README.md

@@ -1,9 +1,6 @@
 <h1 align="center">EA Hub</h1>
-<p align="center">
-    <a href="https://eahub.org/">EAHub.org</a> |
-    <a href="https://discord.gg/NH5PybDUj9">Discord</a> |
-    <a href="https://meta.eahub.org/">News and Feedback</a>
-</p>
+<p align="center"><strong>The <a href="eahub.org">EA Hub</a> has retired (<a href="https://forum.effectivealtruism.org/posts/m3HxhPLDuNcRm8qRN/the-ea-hub-is-retiring">announcement</a>).</strong></p>
+<p align="center"><strong >Head to the Effective Altruism's <a href="https://forum.effectivealtruism.org/people-directory?utm_source=ea_hub&utm_medium=website">People Directory</a> to connect with the community.</strong></p>
 
 The EA Hub enables collaboration and facilitates connections between EAs to make it easier to learn, network, collaborate on projects, and find career opportunities. By improving community infrastructure projects, individuals, and groups, initiatives can build traction more effectively.