cmsetzer

This branch adds https://github.com/socrata/Socrata-PowerShell to the [Libraries & SDKs](https://dev.socrata.com/libraries/) page.

This branch makes several changes to the firm sign-up process: * Removes some use cases (journals, faculty) from the [Sign Up](https://perma.cc/sign-up) section and retitles the [Law Firms](https://perma.cc/sign-up/firms) section as "Other...