[Feature] Configurable option to hide unwanted fields in the task form

[dedrazer]

Hi,

I have been using Donetick and I wish I could hide the fields I never use from the task/chore form. My idea is to let users pass a list of fields to exclude into selfhosted.yaml, and have those fields excluded from the form.

Example:

chore_form:
  hidden_fields:
    - requireApproval
    - isPrivate

Hidden fields would just keep their defaults, so this should be a low-risk, frontend change.

I would gladly open a PR for this myself if you approve of the idea, let me know what you think!

Thanks for the great app.