users would need better explanation for PATs

[VijaySamant4368]

Currently, the access page just asks PAT to be entered, however, the user should know about the dangers and scopes of PATs.

Dangers:

• Though the PATs are stored encrypted, when making a request to GitHub, they are being exposed in memory as well as in requests. Any browser extension monitoring the later can easily access the PAT.
• Abusing of PATs may trigger some unwanted actions on the account associated to the PAT (Refer to Understanding GitHub's policies #3)

Scopes:

• Repository administration: Used to create new repositories when uploading to a new repo.
• Repository contents: Used to read, create, and update files (i.e. upload and fetch images).