Changes to the contact form to prevent spam

[orlando]

We are getting some spam emails in the contact form, this is linked to Discourse PMs so we are getting spam there too.

The idea is to remove this integration and add verification steps in our contact form to prevent spam

Notes

We can use https://www.google.com/recaptcha/intro/v3beta.html, which are easy for users to complete and will prevent most of the bots we are getting emails from.

Tasks

• [ ] Integrate CAPTCHA in the contact form in the tools app.
• [ ] If this doesn't reduce the spam we are getting, disable the Discourse integration and enable back the emails for the contact form.

Acceptance criteria

• Reduce the spam we are getting in Discourse
• We have checks in the contact form to verify that only legitimate users are sending messages through the contact form.

[orlando]

Closed with https://github.com/debtcollective/dispute-tools/pull/79