refactor: Move main.rs

Otherwise adding more modules will let cargo think they are multiple binaries

Cargo.toml

@@ -6,7 +6,7 @@ version      = "0.1.0"
 
 [[bin]]
 name = "esp32-c_its-companion"
-path = "./src/bin/main.rs"
+path = "./src/main.rs"
 
 [dependencies]
 esp-hal = { version = "~1.1.0", features = ["esp32c5", "log-04", "unstable"] }