rename `server` to `runner`

llama/server/README.md → llama/runner/README.md

@@ -1,9 +1,9 @@
-# `llama/server`
+# `runner`
 
 ```
-./server -model <model binary>
+./runner -model <model binary>
 ```
 
 ```
 curl POST -H "Content-Type: application/json" -d '{"prompt": "hi"}' http://localhost:8080/
-```
+```