replace slack sign up

[ahmadnassri]

currently we are using Slackin, which only really serves one purpose:

• email input field and terms of service / code of conduct checkbox
• it then calls the slack apis and sends an invite to the email address to join the group

we would be best served with a custom form on the website frontend, that talks to an API backend (custom built), which in turn can do:

• interaction with the Slack API as Slackin does
• sign up to newsletter (if opt-in) (https://getrevue.co)

[ahmadnassri]

replaces #60

[theetrain]

Frontend

Nav

• Add 'Register' and 'Log in' buttons to top-right

'Join now' area

• Heading: "Join #TechMasters on Slack"
• Subheading: [n] users online now of [k] registered.
• Form: email, first name, surname, avatar (default is gravitar), "I promise not to spam", "I agree to the code of conduct"
  • UX: 'I agree to the code of conduct' is a button, when clicked it opens a modal with the conduct inline, user scrolls to bottom, clicks 'I agree', modal closes, 'I agree...' is checked
• Submit: 'Get my invite'

Backend

• Replace current heroku app with simplified endpoints that hooks the form into Slack