Sort /agencies endpoint

[DanielJDufour]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
It's not really a problem, but I display the agencies sorted by name in the dropdown in the banner in the home area. It would be useful if I could do the sorting server-side.

Describe the solution you'd like
A clear and concise description of what you want to happen.
&sort=name or &sort=acronym should work

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Sorting client side

Additional context
Add any other context or screenshots about the feature request here.
This is low priority because I can sort client side