fix layout

Author: kylebarron

python/python/async_tiff/Cargo.toml renamed to python/Cargo.toml

@@ -0,0 +1,5 @@
+```
+uv sync --no-install-package async-tiff
+uv run --no-project maturin develop
+uv run --no-project mkdocs serve
+```

python/DEVELOP.md

@@ -1,10 +1,5 @@
 #![deny(clippy::undocumented_unsafe_blocks)]
 
-mod coord_type;
-mod kdtree;
-mod rtree;
-pub(crate) mod util;
-
 use pyo3::prelude::*;
 
 const VERSION: &str = env!("CARGO_PKG_VERSION");