Add info about --viteMode flag

[acupofspirt]

Description (required)

These doc changes describe a new flag for the build and dev commands and add additional information about .env files loading.

Related issues & labels (optional)

• Suggested label: merge-on-release

For Astro version: 4.8. See astro PR #10871.

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	May 1, 2024 10:25am

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Locale	File	Note
en	guides/environment-variables.mdx	Source changed, localizations will be marked as outdated.
en	reference/cli-reference.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

Thank you @acupofspirt , this is looking great! I'm sure people will love being able to do this now. 🙌

This was a really nice, well-crafted docs contribution! Just a few suggestions for making it match some of the other entries, and adding our special component for indicating in which version a feature was added. But this will be good to go very easily, I think!