Clarify purpose of Projects and Allocations

[zebulasampedro]

Selective on-page documentation articulating the purpose of Projects and the intended workflow would help reduce confusion:

• Conditional Next Steps alert on Project list page telling the user to create a Project if they have not yet done so.
• Brief explanation of projects
• Conditional Next Steps alert on Project details page telling the user to request an allocation if they have none active.
• Brief explanation of Allocations