Fixed incomplete navigation in about section

[Mohanish-25]

Fixed the incomplete navigation in the about section:

• Configured the application level permissions to use internet.
• Fixed the buttons navigations by adding appropriate links.
• Added the Link widget for better performance.

[andoriyaprashant]

@Mohanish-25 Convert this 'About' button into a list view and remove "Open Source Programs" from app bar

[Mohanish-25]

@andoriyaprashant Okay. I will make the required changes.

[Mohanish-25]

@andoriyaprashant I have completed all the changes that were assigned to me, please merge my pull request