Create Basic User Dashboard

[amazingproducer]

Though we only plan to have a small number of supported services and integrations for this milestone, the need to consolidate and present them to the user exists. Build out the dashboard route as defined in the application notes:

/dashboard, GET:

• Discord User Info and:
  • Affiliated Guild Memberships
  • OAuth Settings
• Silo Busters Info and:
  • Active challenges
  • Achievements
  • Available challenges
• GitHub User Info and:
  • Gist integration Settings
  • OAuth Settings
• StackOverflow User Info and:
  • Notification Opt-in Settings
  • Notification Topic Settings
  • OAuth Settings