Fix SVGs, Update README, Add API

[ksmarty]

• SVGs now work
• All CLI options are now listed
• Added cover page classes to README
• Updated usage example

[ksmarty]

I didn't expect you to merge when you did lol

[ksmarty]

Added some code to make it possible to import and use it as a JS function. Namely for serverless applications.

[ksmarty]

Also, please publish to NPM once merged

[ksmarty]

You can merge my changes to fix SVGs and update the readme, but I'm going to make the serverless version of this a seperate project for now