Add more instructions if not using a template repo

[harsh183]

I really like this action and I just started using this on one of my small projects.

It took me sometime to figure out how to setup the action just right since reading the bash script I couldn't figure out where some of the arguments were coming from. Perhaps you can include something in the instructions on how to add it to an existing projects so that all the environment variables are just right.

[ralexander-phi]

That's really cool! I'm glad to see you got it working.

It looks like you added helpful comments in the workflow for the CS199 EMP site. Do you think I could copy those comments over to the workflow in the template? Is there anything extra you'd recommend? I'm open to pull requests.

[harsh183]

Well basically it took me some time to figure out how to set up MARP_ARGS, and I ended up reading the entire dockerfile and bashscript for it. I think maybe just a table or something in the readme will be good for explaining the options and usage. Nothing too complicated.

Feel free to use any comments as well, you can even provide this as a sample nonstandard version (multiple slide decks on a website).