update: practical_grpc slides

docs/practical_grpc.md

@@ -11,39 +11,18 @@
 
   + Ingredients to build a gRPC API
   + Defining our API with Protocol Buffers
-      + Defining a request
-      + Defining a response
-      + About backwards compatibility
-      + Defining a service
   + Generate a Rust library
-      + Manual project setup
-      + Build script
-      + Exposing a library
   + CI & Release flow
-      + The Buf tool
-      + Checking for breaking changes
-      + How to release
   
   </div>
 
   <div>
 
-  + Implementing a gRPC service
-    + Implementing the service trait
-    + Parsing requests
-    + Error handling
   + Building a gRPC server
-    + Authentication
-    + Tracing
-    + Running our server
   + How to deploy
   + How to call our server
-    + Creating a gRPC client
-    + Authentication
-    + Response handling
   + How is it going so far
-    + Users
-    + Metrics
+
   </div>
 </div>