Pre-list reaperofveriod.nl server on import

- Ship servers.dat override so the multiplayer server appears automatically
- Update README

build_mrpack.py

@@ -17,6 +17,7 @@ OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)),
 
 # (name in instance, override source path) — shipped as-is into .minecraft
 OVERRIDES = [
+    ("servers.dat",                     os.path.join(INSTANCE, "servers.dat")),
     ("config/flywheel-client.toml",   os.path.join(INSTANCE, "config/flywheel-client.toml")),
     ("config/iris.properties",        os.path.join(INSTANCE, "config/iris.properties")),
     ("config/irisflw-client.toml",    os.path.join(INSTANCE, "config/irisflw-client.toml")),