Provide info during grant creation on what fields can & cannot be edited after grant has been created

### User Story

As a user, when creating a new grant it would be helpful to know which fields can be update/edited after the grant is created and which fields cannot. it would also be helpful a minimal recommendation was made around what image size is optimal for the grant.

### Why Is this Needed

When creating a new grant recently I wasn't sure which fields I would be able to edit after creating the grant. As far as I can tell, most fields are editable with the exception of a couple like category and sub-category.

### Description

*Type*:Feature

### Current Behavior
No info is provided on grant creation about what fields can be edited/updated later.

### Expected Behavior
Explicitly notify the user which fields cannot be updated and maybe which fields can.

### Definition of Done
Grant creation wizard clearly shows which fields cannot be edited after creation, implying which can be edited, and maybe some info about optimal image sizes.