New Donor Help Form

[MelissaAutumn]

Fixes #435

The embeddable HTML was a touch "auto-generated", so I've tried to cordon it off as much as possible. FA will only be loaded on our thunderbird.net/donate/help page (excluding custom styling).

There's a bunch of weird tag-along js/css that don't seem to be used but I'm slightly afraid of just removing it. (e.g. I don't even know if the localization js file is ever used..see the quirks below.)

I've already ditched their styling, and re-worked it into something passable for Thunderbird.net.

Once a user submits the form, they will be redirected to FA and then will be sent back to thunderbird.net/donate/help/thank-you. The text mirrors the existing Thunderbird specific text from donate-wagtail's help form https://donate.mozilla.org/en-CA/help/

Quirks:

• No front-end validation is actually done, instead the form is submitted and error checking is handled on their website's form url. It's kind of garbage, but we can't do anything about that. I've added "required" to every field that needed it, so hopefully that normal use-case won't popup too often.
• I have not encountered a scenario where localization.js is used (Foundation might be using it, but it was sort of bunched up in the embedded html output.)
• FA's third party javascript library uses eval() like 7 times? Ew.

Needs a style check, and there's some additional testing happening tomorrow. But it works!

Screenshots:

Mobile:

[MelissaAutumn]

Cool, I have some style tweaks to make but will do after.

[MelissaAutumn]

Adjusted spacing, and colours. This is just pending another round of form testing on the Foundation side.

[MelissaAutumn]

Merging this for staging testing. Functionality-wise it works as expected.

[micahilbery]

Sorry for not catching this sooner. My only criticism is the labels of the form elements feel a little detached from their fields when they aren't stacked. I would do something like this:

[MelissaAutumn]

Thanks @micahilbery I've created a new ticket to follow those changes, if you have anymore feel free to put them in https://github.com/thundernest/thunderbird-website/issues/442