Add links to open tracking issues

[MauriceKayser]

I read through the 0.6 docs, and found a few places that could benefit from linking to tracking issues, for interested users to subscribe to or help with.

Examples:

We plan to build additional server features in the future and only support axum to ship faster. https://github.com/DioxusLabs/docsite/blob/2ec11f638ce712baa55e8f935aebb2e657f3086c/docs-src/0.6/src/guide/backend.md?plain=1#L65

In the future, Dioxus might add OpenSSL's vendored feature implicitly to make this error go away. https://github.com/DioxusLabs/docsite/blob/2ec11f638ce712baa55e8f935aebb2e657f3086c/docs-src/0.6/src/guide/bundle.md?plain=1#L88

As of today, dx bundle only builds desktop apps for the native platform and architecture. https://github.com/DioxusLabs/docsite/blob/2ec11f638ce712baa55e8f935aebb2e657f3086c/docs-src/0.6/src/guide/bundle.md?plain=1#L146

Shadcn-ui: Not yet, a radix-ui port to Dioxus is underway but we're not done yet. https://github.com/DioxusLabs/docsite/blob/2ec11f638ce712baa55e8f935aebb2e657f3086c/docs-src/0.6/src/guide/next_steps.md?plain=1#L53

Static-site-generation: Yes! The docs are currently under construction, so stay tuned. 🏗️https://github.com/DioxusLabs/docsite/blob/2ec11f638ce712baa55e8f935aebb2e657f3086c/docs-src/0.6/src/guide/next_steps.md?plain=1#L55