Is your feature request related to a problem? Please describe.
In projects where no frontend framework or frontend build-systems are used, like pure server-side applications, the easiest way to integrate Iconoir is to use the CSS version. However, Despite the CSS being minified, it is still quite a large resource to load (>2mb) just to use a few icons. Additionally, using the CSS version also limits customization, e.g. the stroke-width is hardcoded (see #317).

Describe the solution you'd like
It would be great if there was a tool to generate a customized version of the Iconoir CSS file. I'm imagining a customization form similar to what is currently available for the preview on the Iconoir website.

Specifying the stroke-width, size, color, and allowing users to select only a subset of Icons (or only a specific icon category) to be included in the generated CSS would be a big enhancement for users of the CSS version and it would dramatically improve loading times for websites. There is no good reason to make end-users download a CSS of 1'400 Icons when only about 20 or so are actually used.

Describe alternatives you've considered
I'm self-hosting the Iconoir CSS. I considered writing a script to strip out all icons from the file that I don't use (about 95% of them 😄 ).

Additional context
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