Consider age-adjustment for gun violence topics

[benhammondmusic]

Right now, we ingest data from CDC WISQARS, and we use their crude rates (and their provided estimated totals).

However, they also provide age adjusted rates. We should consider:

• import those from the source tables
• calculating our own age adjust ratios by comparing each non-white race value to the equivalent for white people (similar to our process for hiv deaths and covid deaths, but without having to perform the actual age-adjustment)
• put the ratios in the age-adjusted table card