Logout users with invalid tokens

[solkaz]

Description

• When a user attempts to access their information with an invalid Github token, the application will clear their credentials and reset the application. This will occur early in the application life cycle, specifically in <CodesplainAppBar />'s componentDidMount method.

• Abstracts much of the promise logic away from the component, and instead lets the thunks handle them.

• This PR relies on this PR being merged in order to work correctly

Motivation and Context

Fix #465

Checklist:

• [ ] My code follows the code style of this project.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

Browsers

• [ ] Chrome
• [ ] Firefox
• [ ] Safari

[thebho]

Why did you refactor all the gists stuff?

[solkaz]

@thebho part of refactoring the CodesplainAppBar, so that most of the logic is abstracted away.

[solkaz]

This "works", but I cannot figure out a way to test this. Merge at your own discretion

[thebho]

Do you mean you don't have a way to write unit tests, or you have never actually seen the code work?

[solkaz]

I don't have a way to write unit tests. I can verify that this works in all browsers, though