feat: GitHub Link Preview Details

[ARYPROGRAMMER]

This Adds the Feature Mentioned in Issue#328

Specifically, for all stories with a GitHub Repo preview I have added an Enhancement to the existing UI to fetch the details of the repo specified and give its preview without even opening it. Thereby providing the user a more seamless experience.

• All features are Working
• Free and Flexible to Change further, Main Logic Implemented Separately
• No Breaking Changes
• Added Enhancement requires Admin's GitHub PAT (Personal Access Token)
• No Render Issues or Time Lags Observed

Sample Image :

[Livinglist]

Hi @ARYPROGRAMMER, thx for your PR, I'm hesitant about adding GitHub preview to the app since I want to keep the app as lean as possible, using FutureBuilder in the root view is also not a good idea since it doesn't cache the response and will request every time the view is reattached.

[ARYPROGRAMMER]

hey @Livinglist , thanks for reviewing my PR. I have a solution which I guarantee you will like. I'll create a GithubCubit Class in the widget tree and make call to it only when needed. Thereby making the app lean. If you want I can start working on it right now and request a new PR or if you have any suggestions, I'll be happy to discuss more on this as this is one of the most required client need.

[ARYPROGRAMMER]

Hey @Livinglist I am done with new changes and thus I'll open a new PR for this.