Update dependencies, fix up Cargo.toml

Cargo.toml

@@ -1,6 +1,8 @@
 [package]
 name = "marzipan"
 description = "A macro processor for ZZT worlds"
+keywords = ["zzt", "gamedev"]
+categories = ["compilers", "command-line-utilities"]
 version = "0.1.0"
 edition = "2024"
 license = "MIT"
@@ -12,7 +14,6 @@ repository = "https://github.com/cmounce/marzipan"
 anyhow = "1.0.86"
 codepage-437 = "0.1.0"
 mzp-peg-macro = { path = "./mzp_peg_macro", version = "0.1.0" }
-insta = "1.39.0"
 nom = "8.0.0"
 compact_str = "0.9.0"
 rustc-hash = "2.1.1"
@@ -25,9 +26,5 @@ insta = "1.39.0"
 insta.opt-level = 3
 similar.opt-level = 3
 
-[[bin]]
-name = "marzipan"
-path = "src/main.rs"
-
 [workspace]
 members = [".", "mzp_peg_macro"]