Feature Request: Custom Preview URL Port

[floaterest]

Currently the TypstPreview command will spawn the typst-preview binary with --static-file-host 127.0.0.1:0, which will let typst-preview choose a random port.

typst-preview.nvim/lua/typst-preview/servers/factory.lua

Lines 30 to 31 in 15eaaff

	'--static-file-host',
	'127.0.0.1:0',

It would be nice if there's an port option in the typst-preview.nvim config for users to choose a port. I'm willing to make an PR for this.

[chomosuke]

I will be happy to review your PR, make sure to document the functionality in both doc/typst-preview.nvim.txt and README.md :).