docs(wasm-languages): rust updates

[vdice]

Mostly focused on updating the example app code/spin.toml, similar to #1403

[vdice]

I'm tempted to completely remove the following WAGI-related mentions:

developer/content/wasm-languages/rust.md

Line 59 in bd5326d

Rust can use Spin's native executor as well as Spin's Wagi executor. We strongly recommend the native one, as it has more features.

,

developer/content/wasm-languages/rust.md

Lines 128 to 130 in bd5326d

	### Writing Wagi-Based Rust Apps
	It is also possible to write a Wagi application in Rust and run it in Spin or Wagi. Examples of this exist [in the Wagi examples repository](https://github.com/deislabs/wagi-examples).

and

developer/content/wasm-languages/rust.md

Line 141 in bd5326d

- DeisLabs has some [Rust Wagi examples](https://github.com/deislabs/wagi-examples)

Thoughts?

[github-actions]

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[itowlson]

Yikes this was ancient. Thanks

[itowlson]

I'm okay with removing the WAGI mentions. Do you want me to hold off on merging this PR, or do you envisage deferring those to a separate PR?

[vdice]

I'm okay with removing the WAGI mentions. Do you want me to hold off on merging this PR, or do you envisage deferring those to a separate PR?

👍 I'll push the changes in this PR.

[vdice]

@itowlson most wagi mentions removed in ef8aec6