Prepare v0.1.1 release for crates.io

- Rename `macros` crate to `libmarathon-macros` for better discoverability on crates.io
- Update all imports from `macros::` to `libmarathon_macros::`
- Add crates.io metadata (description, license, repository, homepage, etc.)
- Bump version to 0.1.1
- Add version requirement for libmarathon-macros dependency

crates/app/Cargo.toml

@@ -11,7 +11,7 @@ headless = []
 
 [dependencies]
 libmarathon = { path = "../libmarathon" }
-macros = { path = "../macros" }
+libmarathon-macros = { path = "../macros" }
 inventory.workspace = true
 rkyv.workspace = true
 bevy = { version = "0.17.2", default-features = false, features = [