Revise resource form - Open Pull Request

Users must fill out a form to add a resource to the database. Some adjustments need to be made to the form including:

• making it possible to select more than one option from the dropdowns
• adding help text
• making the "Requirements" and "License" prompts optional
• adding the ability to add multiple links and give each link a name.
• adding a field where users can specify whether the resource is an open source project, an open education resource, free, or freemium