refactor: rename bal-server-actix.rs to bal-server.rs

- Rename src/bin/bal-server-actix.rs -> src/bin/bal-server.rs
- Update Cargo.toml to point to new filename
- Update Dockerfile reference
- Update docs/08_security_audit.md references

Cargo.toml

@@ -34,7 +34,7 @@ zmq = 			{ version = "0.10.0" }
 
 [[bin]]
 name = "bal-server"
-path = "src/bin/bal-server-actix.rs"
+path = "src/bin/bal-server.rs"
 
 [[bin]]
 name = "bal-pusher"