Private repositories support

[brunolemos]

Fix #32

• Read GitHub App documentation a million times to understand it
  • How to implement it properly
  • All the different types of tokens
  • Limitations (which endpoints work for each token, permissions limitations, etc.)
  • Come up with workarounds for the limitations
  • Plan a good UX to handle all this
• Server side implementation to handle GitHub Apps, GitHub Webhooks and new GraphQL queries
• On authentication flow, get tokens for both GitHub OAuth and GitHub App
• Heuristic to detect if a repository may be private
  • If tried to fetch and received 404 not found, try again with only the owner/org instead
  • If fetched owner successfully, it's probably a private repo. If not, then the user typed an invalid owner/repo, so show the Not Found error.
• If repository is private, show button to setup GitHub App
• If has private access to a private notification, use the Installation token and fetch notification enhancements
• If has private access to a column repository, use the Installation token and fetch the events activity
• Fix flow on mobile apps and electron
• Integrate with Webhooks instead of fetching all data on every login
• Integrate with GitHub Marketplace
  • Have at least 1000 installations on the GitHub OAuth app
  • Have at least 250 installations on the GitHub App
    • Launch a version with the recently created GitHub App to get to this number
  • Get the "devhub" username that seems to be taken but not being used in any real GitHub App
    • Contact GitHub by e-mail multiple times
    • Get the username
    • Launch new version with the new username but without breaking existing apps
  • Start oauth flow automatically after a new app installation
  • Show plan details and allow user to manage the plan from the app's UI
  • Allow user to delete account completely
  • Integrate with Marketplace billing flows
  • Create Incident Response Plan and Vulnerability Management Workflow
  • Comply with the other dozens pre-requisites
  • Submit to GitHub Marketplace
  • Available on GitHub Marketplace