docs: Update README.md

Author: NGPixel

profile/README.md

@@ -8,7 +8,7 @@
 
 <div align="center">
 
--- [View the Roadmap](https://github.com/orgs/ietf-tools/projects/9) --
+🗺️ [View the Roadmap](https://github.com/orgs/ietf-tools/projects/9) | 📔 [Datatracker Website](https://datatracker.ietf.org)
 
 <table><tbody><tr><td valign="top">
 <img width="300" height="1" />