Update webpage text

[josiahseaman]

• Screenshots from program on project.md
• Details on What is the Pantograph Project?
• Donations link -- suggested paypal link: https://www.paypal.me/Computomics
• "Skills needed should be on the top page. One feedback was "Too superficial for an educated scientist.” "

[ChristineSeaman]

3 down one to go

[joehagmann]

my suggestion on integrating donations in PR #7