Instagram backend refactor

[gyata97]

Proposed changes

Instagram has deprecated most of the endpoints on api.instagram and moved all data access to graph.instagram.
Short story: Instagram Basic Display is no longer an authentication solution.
Long story: Instagram Basic Display only works on accounts that are not creator or business accounts and the endpoint will not return data (email, etc) that can be used to authenticate users. However, for creator and business accounts, the facebook backend is the authentication solution. I propose that we keep the Instagram backend for users who want to associate Instagram personal (non-creator and non-business) accounts with authenticated users. It is important to note that Facebook does not verify apps (social_core library users) that use this as an authentication method.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (PEP8, lint, formatting, renaming, etc)
• Refactoring (no functional changes, no api changes)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build related changes (build process, tests runner, etc)
• Other (please describe):

Checklist

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works

Other information

[gyata97]

This pull request is a response to the open issue: #419

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.