[chore]: prompt the user to create a personal access token beforehand

[SSmale]

Describe the bug
The docs do not include the features that the application is requesting to use from GitHub or the steps needed to use the application CLI with 2FA enabled.

[SSmale]

the relevant GitHub Help page

[jamesgeorge007]

We can prompt the user to create a personal access token and provide it instead while being prompted for the credentials. Feel free to shoot up a PR 👍

[rishabhKalakoti]

I need a little clarification. Do we need to add this just to the docs or we should also add it when teach-code is initialized and personal access token is requested?

[jamesgeorge007]

Done in #48