[Nice to Have] Implement signature on screen

Currently, accepting the legal terms of using this platform and the housing conditions is done by the user clicking on Continue in the Request and Offer forms. We need a more legally binding option, the possibility that the user signs on the screen.

The flow should be as follows.
- as a user I go to Offer housing
- I read the Terms and conditions section.
- I click on the Sign and continue button
- a modal pops and i can sign inside that modal
- i click save and i move to the next step.

The signature should be stored and displayed in my profile visible to both the admin and myself as a Host.