Allow external imports in html template

[jroru]

Description

As a developer using Vite I want to import files (e.g. an SVG icon) from a dependency in the HTML template.

See example: https://stackblitz.com/edit/vitejs-vite-l1zbnrgk?file=packages%2Fweb-app%2Findex.html

Suggested solution

Unaware

Alternative

I could simply copy the file into my own repo's public folder, but it is then duplicated. If I import the file elsewhere in my JavaScript, there will be two copies uploaded to the CDN.

Additional context

https://stackblitz.com/edit/vitejs-vite-l1zbnrgk?file=packages%2Fweb-app%2Findex.html

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.