feat(plugins): add Starlight Ion theme

[Ast3risk-ops]

Description

Added the Starlight Ion theme since it's featured on https://astro.build (themes section > docs) yet for some reason it's not showcased in the Starlight docs.

I did not make this theme.

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[trueberryless]

Thank you for your first contribution to Starlight, @Ast3risk-ops!

Everything looks good to me!
(The additional four spaces will be formatted by the CI formater)

[delucis]

Thanks for sharing this! I think the reason this hasn’t been included so far is that it isn’t a Starlight plugin, which is what this page is focused on:

A theme is a Starlight plugin that changes the visual appearance of a site with component overrides, custom CSS, or other new features.

It looks very cool, but Ion is a template repository that includes custom components and overrides hardcoded rather than a plugin you install and extend Starlight with. That’s not necessarily a bad thing — it makes Ion’s components very flexible when you copy the template because you can edit them directly in your project. But it does mean we may need to think for a second how best to showcase it.

[trueberryless]

Thanks for sharing this! I think the reason this hasn’t been included so far is that it isn’t a Starlight plugin.

My bad, I didn't look into this aspect thoroughly enough.

[delucis]

I guess one option could be to add https://louisescher.github.io/starlight-ion-theme/ to the Site Showcase instead? At least it would be linked that way.

[Ast3risk-ops]

I guess one option could be to add louisescher.github.io/starlight-ion-theme to the Site Showcase instead? At least it would be linked that way.

It's not a site using starlight though, it's a set of components.