docs: add building-for-mobile guide

[OneEyed1366]

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Description(required)

Adds a "Building for mobile" guide under Guides, closing the docs gap in #1636: there was no answer to "can I build a mobile app with Solid?" and solid-js/universal (createRenderer) had no mention anywhere in the docs.

Covers three routes:

• Keeping the DOM renderer — Capacitor, Tauri (WebView), NativeScript (DOM shim over native views)
• Native views via solid-js/universal — the createRenderer API, with SolidTV and Symbiote Native as production examples

Also notes solid-native is deprecated — flagged maintained: false on solidjs.com's Resources page, per the issue's own data point.

Related issues & labels

• Closes [Request]: Cover native/mobile rendering (solid-js/universal) - the docs have no answer to "can I build a mobile app with Solid?" #1636
• Suggested label(s) (optional): 'enhancement', 'documentation'

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[OneEyed1366]

@LadyBluenotes ready for review whenever you have bandwidth - all checks are green. ☕

[LadyBluenotes]

Really good start and thank you for taking this on!

Do you mind expanding a bit on some parts? It still feels like there's only two options for the renderer and I think it would benefit from expanding a bit. We don't need it to explain everything in detail, but providing more context can be helpful for people in helping make decisions.

[OneEyed1366]

Thanks for the review, all points addressed in the latest commit. One question: the custom renderer row now names no example, so readers have nothing concrete to follow. Would you prefer a single link to a working renderer there, or is a Resources entry on solidjs.com the better place for that?

[OneEyed1366]

Ping 🐶

[LadyBluenotes]

Ping 🐶

I do work during the week. I will get to reviews when I can, please stop pinging unless it's been over a week.

[OneEyed1366]

Ok, sorry.

[LadyBluenotes]

Thank you!