Some minor fixes to issues I ran into using devcontainer on this project
with vscode.
- Add `esbenp.prettier-vscode` to the recommended extensions list as
it's already used in `.vscode/settings.json`
- Install `wasm32-unknown-unknown` Rust target in devcontainer
- Add cargo-binstall and pin cargo-about version in devcontainer
- Remove `no-clearly-defined = true` from `about.toml`:
- cargo-about 0.9.1 fails to run if `no-clearly-defined` is present
- cargo-about 0.8.0 already [removed
support](https://github.com/EmbarkStudios/cargo-about/blob/main/CHANGELOG.md#080---2025-09-05)
for clearlydefined.io, so the argument is a no-op
