improve accessibility of the ss user manual pdf

[k-doering-NOAA]

Improve accessibility of the pdf file rendered from all of the .tex files in the main folder. These are rendered using lualatex. Continued from #20.

[k-doering-NOAA]

@kellijohnson-NOAA suggested looking at the .json file generated as an intermediate to creating a pdf. This should provide some insight into which elements are not being tagged correctly

Another suggestion is to add contact info so it easy to know who to contact if something isn't accessible.