[Feature]: Allow specifying output file name

Feature Request

I'd like to be able to specify my own name for the output file. Anything other than index.html. Opening because #17407 was closed without resolution, and I'd really like this feature. If it's approved, I'll implement it. I've pretty much got it written already.

Example

No response

Motivation

Improved flexibility, and a feature that's very common in similar software, so users expect it. I certainly did.