Add link to github from ASCT+B validation website page

[emquardokus]

@anitacaron can you add a direct link to https://github.com/hubmapconsortium/ccf-validation-tools/discussions/ from the https://hubmapconsortium.github.io/ccf-validation-tools/ web page?

Maybe upper right corner under the ASCT+B tracking updates link?
This would be super useful; I had a hard time getting to this so I could edit directly in github and add check marks to my boxes from my comments from report changes website view.

Thank-you!

[anitacaron]

Hi Ellen, could you save the link in your bookmark for now, please? 😃