Add a setting in settings.py to define a custom edit icon

[blasferna]

Currently, the icon for the edit function is hard-coded. This limits the ability for users to personalize their interface based on their specific needs.

Add a new setting in settings.py, say CRIPSY_FORMSET_MODAL. This will enable users to define specific parameters of the package via a dictionary configuration.

Example

# In settings.py
CRISPY_FORMSET_MODAL = {
    "edit_icon": {
        'bootstrap4': "...",
        'tailwind': "...",
        'bulma': "...",
        'bootstrap5': "..."
    }
}

[blasferna]

Closed because #12 implements a better approach