[B2BP-969] Add the the new contents related to documents in app

[lordkada]

List of Changes

• Added a new dedicated page related to documents in app
• Added box in the homepage
• Added a new FAQ section
• Updated images

Motivation and Context

To inform users about the new features

How Has This Been Tested?

Manually

Screenshots (if appropriate):

N/A

Types of changes

• [ ] Chore (nothing changes by a user perspective)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.