Responsive for donation form

[furilo]

@nobuti frontend code-wise should we tackle it?

[nobuti]

I uploaded a wip to 122-responsive-donation-form branch. I have to make some white spacing improvements yet. Some ideas:

• Can we change the date field and the private field? I think we can make the date field full width for mobile.
• Others designs considerations will be welcome :)

[furilo]

#123 ;)