Remove link to expired erpc.io

Author: anujkaliaiitd

README.md

@@ -2,8 +2,7 @@
 
 eRPC is a fast and general-purpose RPC library for datacenter networks.
 Our NSDI 2019 [paper](https://www.usenix.org/system/files/nsdi19-kalia.pdf)
-describes the system in detail.
-[Documentation](https://erpc.io/docs/index.html) is available online.
+describes the system in detail. Documentation can be generated by running `doxygen`.
 
 Some highlights:
  * Multiple supported networks: Ethernet, InfiniBand, and RoCE