Add --typescript flag removal to v5 upgrade guide

[HiDeoo]

Description (required)

As discussed on Discord, this PR adds a new section to the breaking changes of the v5 upgrade guide to document the removal of the --typescript flag from create-astro.

Related issues & labels (optional)

• Closes #
• Suggested label: 5.0

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Tracked Files

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en/guides/upgrade-to/v5.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	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]

Thanks for jumping on this @HiDeoo ! See what you think of below.