Add carto keys

[wagnerlmichael]

This PR adds a carto API key (account created with assessor data email address), so that the maps in the homeval html pages render correctly.

Prod and staging URLs added as referrers to this key, nothing else. In attempting to add the localhost, I realized that two separate accounts (and emails) are needed. For this reason and security reasons I'm going to plan to tackle local host in a separate issue, likely with an API key per dev strategy and adding documentation.

One pin updated on prod and staging:
Staging: https://modval-stage.cookcountyassessoril.gov/2026/16074030360000.html
Prod: https://homeval.cookcountyassessoril.gov/2026/16074030360000.html

Note: For the map to function properly we will need to redeploy. I'm assuming we redeploy back to 2025 and 2024 as well?

[jeancochrane]

Great work, thanks for taking this on!

I do think we'll need to redeploy past years, but we should be fine to select the option "Only generate reports for PINs that are eligible for reports" because only eligible PINs have maps. I think we should probably deploy year-by-year, and start with a staging deployment for each year so that we can make sure it works properly. How does that sound to you?