docs(development): note pixi requirement

Author: thewtex

docs/development/hacking_itk_wasm.md

@@ -2,7 +2,7 @@
 
 ## TLDR
 
-Install Podman, and
+Install [Podman] and [Pixi], and
 
 ```sh
 npm i -g pnpm
@@ -57,7 +57,7 @@ To prevent Git repository bloat, we add testing data through [CMake content link
 
 ## Build environment Docker images
 
-Builds of the [wasm build environment Docker images](../introduction/parts.md#docker) or WebAssembly modules require [Podman](https://podman.io/docs/installation).
+Builds of the [wasm build environment Docker images](../introduction/parts.md#docker) or WebAssembly modules require [Podman].
 *Note*: on Linux, ensure the [`vfs` podman storage driver is not used for best performance](https://github.com/containers/podman/issues/13226#issuecomment-1555872420).
 
 To pull the `latest` the build environment Docker images,
@@ -235,6 +235,8 @@ and rebuild whenever the documentation changes.
 [ITK]: https://docs.itk.org
 [ITK Software Guide]: https://itk.org/ItkSoftwareGuide.pdf
 [Node.js / NPM]: https://nodejs.org/en/download/
+[Podman]: https://podman.io/docs/installation
+[Pixi]: https://pixi.sh/
 [pnpm workspace]: https://pnpm.io/workspaces
 [PNPM]: https://pnpm.io/
 [pnpm filters]: https://pnpm.io/filtering