chore: remove mixer provider

Author: SimonSchick

API.md

@@ -3,7 +3,7 @@
 
 **bell** ships with built-in support for authentication using `ArcGIS Online`, `Auth0`, `AzureAD`,
 `BitBucket`, `Cognito`, `DigitalOcean`, `Discord`, `Dropbox`, `Facebook`, `Fitbit`, `Foursquare`,
-`GitHub`, `GitLab`, `Google Plus`, `Google`, `Instagram`, `LinkedIn`, `Medium`, `Meetup`, `Mixer`,
+`GitHub`, `GitLab`, `Google Plus`, `Google`, `Instagram`, `LinkedIn`, `Medium`, `Meetup`,
 `Nest`, `Office365`, `Okta`, `Phabricator`, `Pingfed`, `Pinterest`, `Reddit`, `Salesforce`, `Slack`,
 `Spotify`, `Stripe`, `trakt.tv`, `Tumblr`, `Twitch`, `Twitter`, `VK`, `Wordpress`, `Windows Live`,
 and `Yahoo`.

Providers.md

@@ -459,21 +459,6 @@ credentials.profile = {
 };
 ```
 
-### Mixer
-
-[Provider Documentation](https://dev.mixer.com/reference/oauth/index.html)
-
-- `scope`: Defaults to `['user:details:self']`
-- `config`: not applicable
-- `auth`: https://mixer.com/oauth/authorize
-- `token`: https://mixer.com/api/v1/oauth/token
-
-The default profile response will look like this:
-
-```javascript
-//Default profile response from Mixer
-```
-
 ### Nest
 
 [Provider Documentation](https://developer.nest.com/documentation/cloud/how-to-auth)

lib/index.d.ts

@@ -30,7 +30,6 @@ export type Provider =
     | 'live'
     | 'medium'
     | 'meetup'
-    | 'mixer'
     | 'nest'
     | 'okta'
     | 'phabricator'

lib/providers/index.js

@@ -25,7 +25,6 @@ exports = module.exports = {
     live: require('./live'),
     medium: require('./medium'),
     meetup: require('./meetup'),
-    mixer: require('./mixer'),
     nest: require('./nest'),
     okta: require('./okta'),
     phabricator: require('./phabricator'),