docs: add troubleshooting article for UNUSED_EXTERNAL_IMPORT build warning

[mandarini]

Description

Adds a troubleshooting article for the UNUSED_EXTERNAL_IMPORT build warnings
that Vite/Rollup/Nuxt users see when bundling apps that use @supabase/supabase-js.

File: apps/docs/content/troubleshooting/unused-external-import-warning-vite-rollup.mdx

What the article covers

• What the warning looks like
• Why it's a false positive (re-exported external imports not recognised as "used"
  by Rollup's code-body check)
• onwarn suppression snippet for Vite/Rollup
• onwarn suppression snippet for Nuxt

Related

• Unused import warnings persist in dist/index.mjs despite #1979 fix supabase-js#2010
• docs(supabase): document UNUSED_EXTERNAL_IMPORT build warning as false positive supabase-js#2122

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[supabase]

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[ChrisChinchilla]

Minor formatting, otherwise, good to go

[github-actions]

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