feat: Added card_height option

[hany-z]

feat: create height option

• Created input for height option in form (src/demo/index.php)
• Update custom image height in process (src/card.php)

Description

Fixes #659

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

[hany-z]

I made a small change that help with this issue.

[DenverCoder1]

Looks great! Thanks for the contribution 🎉

Having the numbers outside the SVG also helps with maintainability, so this is great 👍

[hany-z]

Thanks