Design manage form component

[L-Mario564]

Depends on #58.

Provide a UI where the user can manage any kind of form.

• Any conditions mentioned in #58 must bet met here and communicated to the user.
• If the user desires to delete the form, prompt them for confirmation before deleting.
• The user should have the option to either set a date for closing the form or immediately open/close it.
• The description, thank you message, and closed message can be written in markdown, so the UI must provide markdown shortcuts.
• The UI for managing fields should be relatively similar to Google Forms (again, following any requirements outlined in #58).
• The toggle for anonymousResponses should be unavailable (hidden) if it's a tournament form for staff registration.
• The select for target should be unavailable (hidden) if it's a tournament form for staff registration.