[new] add formspree with integrated recaptcha

[Green-Ranger11]

Describe your changes

• Add formspree

Issue ticket number and link

This closes #29

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• Will this be part of a product update? If yes, please write one phrase about this update.

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[westerandr]

LGTM!