#710 | Remove unused and deprecated app.count method

[sssserrano]

Description

• Remove unused and deprecated app.count() method
• Format imports with pre-commit hook

Fixes #710

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [X] I have checked my code and corrected any misspellings

Maintainer Checklist

• [ ] closes #710
• [ ] Made sure Checks passed