Integrate with https://github.com/chas-academy/chas-academy-helplist/

[lessp]

Epic:

Parent of #21
Parent of #22

---

My current idea is to migrate all the data from the previous help-app to the new one. I've begun to experiment with "Sign in with Slack" and current have a basic implementation working for it.

We could then map requests from the front-end to the backend similarly like the /mayday-route does.

We could then just use the current implementation of the Event-handler since method-calls like Slack.IO.isAdmin uses the Slack user-id.

Auth-response from Slack:

Easiest would be to just save it in the session in Express.

{
  ok: true,
  access_token: 'xxx',
  scope:
    'identify,bot,commands,identity.basic,identity.email,identity.avatar,identity.team',
  user: {
    name: 'Tom Ekander',
    id: 'U6RUUDBS9',
    email: 'tom.ekander@chasacademy.se',
    image_24:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_24.png',
    image_32:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_32.png',
    image_48:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_48.png',
    image_72:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_72.png',
    image_192:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_192.png',
    image_512:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_512.png',
    image_1024:
      'https://avatars.slack-edge.com/2019-01-17/526520224852_7ac07601bca38d598a15_1024.png',
  },
  team: {
    id: 'T4WV23X5X',
    name: 'Chas Academy',
    domain: 'chasacademy',
    image_34:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_34.png',
    image_44:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_44.png',
    image_68:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_68.png',
    image_88:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_88.png',
    image_102:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_102.png',
    image_132:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_132.png',
    image_230:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_230.png',
    image_original:
      'https://avatars.slack-edge.com/2017-04-11/168353106134_54bac3f3c035be918326_original.png',
  },
}