Apply remaining settings for admin and about us page

[brunorplima]

• [x] Unconfirmed order older than its statusUpdatedAt + settingsModel.unconfirmedOrderExpiryTime should be changed to a canceled order.
• [x] Remove the need for aboutUsContent to have a /n in the textarea to have the content with paragraph like in about us page
• [x] Remove from settings the following for now: allowUserToRemoveToppings, maxAmountOfRemoves, and allowUserToGiveSpecialInstructions