enhancement(Cards) buttons mixin implementation + auto init

[gselderslaghs]

Proposed changes

Implemented changes as described in #565
Updated cards components to initialize if not initialized manually, fixesissuecomment#539

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to change).

Checklist:

• I have read the CONTRIBUTING document.
• My commit messages follows the conventional commit format
• My change requires a change to the documentation, and updated it accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.