Add placeholder --run-server support.

This allows the program to run as a web server,
which will eventually be able to return
mushroom models.

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 [dependencies]
 approx = "0.5.1"
 clap = { version = "4.5.4", features = ["derive"] }
+rocket = "0.5.1"
 serde = "1.0.203"
 serde_derive = "1.0.203"
 stl_io = "0.7.0"