Draft new page for About loans and debts

[dorothyyeager]

Summary

What we're after:
We've got an "about receipts" page at https://www.fec.gov/campaign-finance-data/about-campaign-finance-data/about-receipts-data/ and are making an "about disbursements" page too. We want an "about loans and data" page. All of these pages would be linked off of https://www.fec.gov/campaign-finance-data/about-campaign-finance-data/.

Related issues
#3498 -Expand About this Data page

Completion criteria

• Language for About data and loans page is drafted
• New page content is reviewed by @PaulClark2 and Press/Public Records
• New page is published with second pair of eyes
• New page is linked on https://www.fec.gov/campaign-finance-data/about-campaign-finance-data/
• Tickets for next phase are created

Future work

-About this data is added to Data landing page and drop down menu
-We take off mention of debts on https://www.fec.gov/data/browse-data/?tab=loans-debts since they aren't coming soon.