improve how to contribute section

[chrstngyn]

https://openmodelingfoundation.github.io/contribute/

perhaps we can improve the layout and delivery of this information better rather than communicating this info in a paragraph? we could embed a pdf into the web page:

How to Contribute.pdf

[cmbarton]

I'm confused. It looks like it is a web page and not a PDF. Are you suggesting we make it a PDF?

[chrstngyn]

No, I'm suggesting we embed the pdf inline so it can be viewed in the page without having to click on it to open a new page like so:

We can also do this to the schematic flow pdfs mentioned in #280.

[cmbarton]

I guess I never noticed the PDF in addition to what is already there in text.

[cmbarton]

Sort of makes your point

[alee]

I like the simplified schematic but would prefer to render it in HTML instead of a PDF attachment if possible - thoughts?

[cmbarton]

Better in html unless you need to download. Probably not important here