Replace user configuration with KDL and improve Rust source spacing

compositor/Cargo.toml

@@ -6,6 +6,7 @@ license.workspace = true
 rust-version.workspace = true
 
 [dependencies]
+ferese-config = { path = "../crates/ferese-config" }
 ab_glyph = "0.2.32"
 fontdb = "0.23.0"
 calloop.workspace = true
@@ -20,7 +21,6 @@ image = { version = "0.25.10", default-features = false, features = ["png", "jpe
 smithay.workspace = true
 serde.workspace = true
 serde_json.workspace = true
-toml.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true
 xcursor.workspace = true