[rust] add missing metadata (#1325)

### Description

<!--
✍️ Write a short summary of your work. Screenshots and videos are
welcome!
-->

### Demo URL

<!--
Provide a URL to a live deployment where we can test your PR. If a demo
isn't possible feel free to omit this section.
-->

### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

Author: ecklf

rust/axum/README.md

@@ -2,8 +2,16 @@
 name: Rust Axum Web Framework
 slug: rust-axum
 description: A Rust web application using the Axum framework with streaming capabilities on Vercel.
-framework: Axum
+framework:
+  - Other
+type:
+  - Starter
+css:
+  - None
+githubUrl: https://github.com/vercel/examples/tree/main/rust/axum
+demoUrl: https://rust-axum.vercel.app
 deployUrl: https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/rust/axum&project-name=rust-axum&repository-name=rust-axum
+publisher: Vercel
 relatedTemplates:
   - rust-hello-world
 ---

rust/hello-world/README.md

@@ -2,8 +2,16 @@
 name: Rust Hello World
 slug: rust-hello-world
 description: Simple Rust serverless functions demonstrating basic HTTP handling and performance benchmarks.
-framework: Other
+framework:
+  - Other
+type:
+  - Starter
+css:
+  - None
+githubUrl: https://github.com/vercel/examples/tree/main/rust/hello-world
+demoUrl: https://rust-hello-world.vercel.app
 deployUrl: https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/rust/hello-world&project-name=rust-hello-world&repository-name=rust-hello-world
+publisher: Vercel
 relatedTemplates:
   - rust-axum
 ---