Fix API links in Statutes

[PaulClark2]

What we're after:
Following up on the work to update that message on the Statutes search, we now need to update the links to make sure that when a user clicks on the link to a specific statute that it actually goes to the appropriate page.

Related issues

• Update advanced search opening message #3112

Completion criteria

• Update the links to the API so they point to the govinfo API, not http://api.fdsys.gov/ for each provision (which GPO has moved on from using).
  For Title 26: See https://www.govinfo.gov/app/details/USCODE-2017-title26/USCODE-2017-title26-subtitleH for details
  For Title 52: See https://www.govinfo.gov/app/details/USCODE-2017-title52/USCODE-2017-title52-subtitleIII for details.

Future work

Open up followup tickets to consider how to improve the Statutes search.

[lbeaufort]

This is an API issue, so moving to the openFEC repo. Check out the index_statutes function in the API.

Example query: https://fec-dev-api.app.cloud.gov/v1/legal/search?hits_returned=20&type=statutes&from_hit=0&q=contribution

[lbeaufort]

Issue moved to fecgov/openFEC #3942 via ZenHub