Usage as a library needs some adjustements

[yamafaktory]

Hi,

There are two minors issues folks can potentially face when using the tool as a library (me included 😄 ):

• the Warning struct is not explosed in the lib.rs so this make it difficult to deal with it
• the preflight.css asset should be included at compile time using e.g. include_str! (e.g.https://github.com/pintariching/railwind/blob/eec138c3a3e693cb4e61f53f0e8e7ff94ee9e9f8/railwind/src/lib.rs#L185) because now it panics when toggling the bool to true (which makes sense since the file doesn't exist)

[pintariching]

Now that you mention it, I don't know whyI haven't thought about this 😅. Thanks for bringing it up, I'll fix the issue shortly.

[pintariching]

Okay I think I fixed these issues in the 0.0.10 version of the CLI.