link the manual and docs in the readme

Author: schell

README.md

@@ -7,6 +7,10 @@ The project, currently in the alpha stage, aims for rapid loading of GLTF files,
 Development emphasizes performance, ergonomics, observability and the use of modern rendering techniques like forward+ rendering and 
 physically based shading.
 
+Read the [manual](https://renderling.xyz/manual/index.html) to get started.
+
+Read the [docs](https://renderling.xyz/docs/renderling/index.html) for more info.
+
 Visit <https://renderling.xyz> to read the development blog.
 
 <img width="912" alt="ibl_environment_test" src="https://github.com/schell/renderling/assets/24942/297d6150-64b2-45b8-9760-12b27dc8cc3e">

crates/renderling/src/lib.rs

@@ -241,6 +241,9 @@ pub mod ui;
 
 pub extern crate glam;
 
+// TODO: document the crate's feature flags here.
+// Similar to [ndarray](https://docs.rs/ndarray/latest/ndarray/#crate-feature-flags).
+
 #[macro_export]
 /// A wrapper around `std::println` that is a noop on the GPU.
 macro_rules! println {