chore: remove the iife declaration

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Name	Status	Preview	Comments	Updated
intro-js	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 25, 2023 at 2:18PM (UTC)

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Size Change: -12.2 kB (-25%) 🎉

Total Size: 36.7 kB

Filename	Size	Change
dist/intro.iife.js	0 B	-12.2 kB (removed)	🏆
dist/intro.module.js	12.2 kB	+1 B (0%)
dist/minified/intro.min.js	12.3 kB	+1 B (0%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/intro.js` | 12.3 kB |

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