Silence i18n content collection warnings

[delucis]

Closes #1174

Currently, there are two warnings logged related to the i18n content collection when running our basic starter kit (i.e. with no i18n files set up):

1. A warning that an i18n collection is configured but doesn’t exist on disk (on dev/build start up):

   The i18n collection is defined but no content/i18n folder exists in the content directory. Create a new folder for the collection, or check your content configuration file for typos.

2. A runtime error when Starlight actually calls getCollection('i18n') to again say that the collection directory doesn’t exist:

   The collection i18n does not exist or is empty. Ensure a collection directory with this name exists.

Many of us Starlight users have trained ourselves to ignore these warnings, but they remain confusing especially for newer users who assume they need to fix something.

This PR addresses both of these points:

1. Removes the i18n collection set-up from our two starter templates, which stops Astro emitting that first warning. Means people have to add that manually if they need the custom i18n features, but we do already document that in our “Translate Starlight’s UI” docs.

2. Hackily overrides console.warn() briefly while we make our getCollection('i18n') call, so that we swallow the runtime error. Admittedly, this is a bit gross, but I considered the options and I feel like the warning does have quite a bit of value for your average Astro users, so removing it upstream seemed kind of unfair.

   @Princesseuh also suggested adding a “noWarn” option to the query APIs to support this officially. I think that could be a nice idea, but I’m not 100% sure the use case is widespread enough to justify that yet.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4c71f27

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Feb 6, 2024 3:01pm

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Name	Status	Preview	Updated (UTC)
starlight-i18n	⬜️ Ignored (Inspect)		Feb 6, 2024 3:01pm

[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	5.22 KB (0%)
/_astro/*.js	21.54 KB (0%)
/_astro/*.css	13.13 KB (0%)

[natemoo-re]

Good stop gap until we can upstream a fix!

[delucis]

Thanks for the review Nate 💖