Improve robustness of GitHub repo URL parsing

[devnoname120]

For example this works now: https://github.com/MichaelAquilina/zsh-auto-notify/pull/67/files
Previously 67 was taken as the repo owner and files as the repo name.

[payne911]

Thanks for this! It's a neat improvement.

A few things to change :)
After your changes, please provide a screenshot showing the results of different test-cases:

• empty input
• bob
• bob/bob
• https://github.com/useful-forks/useful-forks.github.io/pull/71/files
• useful-forks/useful-forks.github.io/pull/71/files
• github.com/bob
• github.com/payne911/PieMenu
• payne911/PieMenu

Example

[devnoname120]

@payne911 I don't have the time to take 8 screenshots but here are the results:

• empty input

Performs a search for payne911/PieMenu.

• bob

Please enter a valid query: it should contain two strings separated by a "/"

• bob/bob

There seems to have been an error.
Maybe you had a typo in the provided input? Or the Access Token credentials are invalid?
If the scan is continuing, ignore this: the GitHub API some times returns erroneous data.

• https://github.com/useful-forks/useful-forks.github.io/pull/71/files

The query field content is replaced with useful-forks/useful-forks.github.io and it performs that query.

• useful-forks/useful-forks.github.io/pull/71/files

Please enter a valid query: it should contain two strings separated by a "/", or the full URL to a GitHub repo

• github.com/bob

There seems to have been an error.
Maybe you had a typo in the provided input? Or the Access Token credentials are invalid?
If the scan is continuing, ignore this: the GitHub API some times returns erroneous data.

• github.com/payne911/PieMenu

Please enter a valid query: it should contain two strings separated by a "/", or the full URL to a GitHub repo

• payne911/PieMenu

Performs a search for payne911/PieMenu.

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If you have further comments and in order to avoid back-and-forths, I'd be grateful if you could address them directly. 🙏 Note that you have write access to this branch.