Scrape supporting documents for the Public Charge Project

[dotj]

Context:

• NILC Proposal
• regulation.gov page

Proposed Timeline:

• The comment period closes on December 10.
• This proposal is being presented on October 23.
• Goal: to have the database capturing data by the first week in November.

This issue is a continuation of #48

Goal
Scrape the "Supporting Documents" on the regulation.gov page.