Form Validation - HFLA Website URL

### Overview
Currently, the projects details form doesn't have any validation. It increases onboarding time because user needs to go back and frequently correct typos (Form validation). Specifically, the HfLA URL on the project details page requires validation, but should remain a field that is optional to fill out (**NOT** a required field).

### Action Items
The project’s form fields need data validation, as opposed to them being free text fields.
Updated form should look as follows:
- [ ] HFLA Website URL: add in validation - `https://www.hackforla.org/projects[ ]`
- [ ]`https://www.hackforla.org/projects[ ]` is the placeholder text in the field.
- [ ] Validation will display an error message if the URL does not reflect a URL with `https://www.hackforla.org/projects`.
- [ ] Red error message text displays below the field with the following text: "Invalid URL - Correct or Delete URL"
- [ ] Field is _NOT_ required to be completed, but if a URL is entered, it must be validated.
- [ ] Developers to find the best way to validate.

### Resources/Instructions
Screenshot of HFLA Website URL on VRMS Project Page