Regenerate the legislators menu on each deployment

[waldoj]

To ensure that the legislators menu is kept up to date, regenerate it on each deployment.

Steps

• [ ] write a script that will generate the HTML, basing it on the existing, manual script
• [ ] put a placeholder in the template file for the legislators menu (e.g., {{legislators}})
• [ ] write a script that replaces the placeholder with the generated HTML, run on the server upon deployment (i.e., appspec.yml)

I'm nervous that, when this inevitably fails, there will be no legislators menu. That's something to think about.

[waldoj]

One solution to deal with failure is to output a static file each time, and then inject that into the template. That way, when this fails, it can fall back to using the prior run's static file.