remove UTP, rename LICENSE files and other minor polish

Author: 0xFA11

.editorconfig

@@ -35,5 +35,3 @@ projects:
     packages:
       - name: com.unity.multiplayer.mlapi
         path: com.unity.multiplayer.mlapi
-      - name: com.unity.multiplayer.transport.utp
-        path: com.unity.multiplayer.transport.utp

.gitattributes

@@ -32,7 +32,6 @@ This repository is broken into multiple components, each one implemented as a Un
 ```
     .
     ├── com.unity.multiplayer.mlapi            # The core netcode SDK unity package (source + tests)
-    ├── com.unity.multiplayer.transport.utp    # Transport wrapper for com.unity.transport experimental package (not currently supported)
     └── testproject                            # A Unity project with various test implementations & scenes which exercise the features in the above package(s).
 ```
 

.yamato/project.metafile

@@ -32,7 +32,6 @@ This repository is broken into multiple components, each one implemented as a Un
 ```
     .
     ├── com.unity.multiplayer.mlapi            # The core netcode SDK unity package (source + tests)
-    ├── com.unity.multiplayer.transport.utp    # Transport wrapper for com.unity.transport experimental package (not currently supported)
     └── testproject                            # A Unity project with various test implementations & scenes which exercise the features in the above package(s).
 ```