use KDL instead of TOML

Cargo.toml

@@ -8,11 +8,11 @@ authors = ["Stephen Byrne"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-# for config yaml
-serde = { version = "1.0", features = ["derive"] }
-toml = "0.8.19"
-
 # for json output from swaymsg
+serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.133"
 
+# for config file
+kdl = "4.7.1"
+
 xdg = "2.5.2"