docs: update README for public repo

README.md

@@ -1,10 +1,12 @@
 # xmtp-node-go
 
-This repo provides the node software that currently forms the XMTP network.
+This repo provides software for the nodes that currently form the XMTP network. **No new development is planned for this node software.**
 
-This repo is private because this node software is not meant for public use. All nodes that currently form the XMTP network are run by XMTP Labs.
+At this time, all nodes in the XMTP network are run by XMTP Labs, whose mission is to promote and support the development and global adoption of XMTP.
 
-If you're interested in an **experimental** version of XMTP node software that might be used to form the XMTP network in the future, see [xmtpd](https://github.com/xmtp/xmtpd).
+All new development is focused on [xmtpd](https://github.com/xmtp/xmtpd), an **experimental** version of XMTP node software. 
+
+After `xmtpd` meets specific functional requirements, the plan is for it to become the node software that powers the XMTP network. In the future, anyone will be able to run an `xmtpd` node that participates in the XMTP network.
 
 ## Instructions