scripts, docs: remove references to dockershim.

Author: klihub

docs/introduction.md

@@ -1,10 +1,10 @@
 # Introduction
 
 CRI Resource Manager is a Container Runtime Interface Proxy. It sits between
-clients and the actual Container Runtime implementation (containerd, cri-o,
-dockershim+docker), relaying requests and responses back and forth. The main
-purpose of the proxy is to apply hardware-aware resource allocation policies
-to the containers running in the system.
+clients and the actual Container Runtime implementation (containerd, cri-o)
+relaying requests and responses back and forth. The main purpose of the proxy
+is to apply hardware-aware resource allocation policies to the containers
+running in the system.
 
 Policies are applied by either modifying a request before forwarding it or
 by performing extra actions related to the request during its processing and