Test EPATADA package vignettes and provide feedback

[cristinamullin]

Is your feature request related to a problem? Please describe:

Review any of the TADA vignettes (Rmd files) here: https://github.com/USEPA/EPATADA/tree/develop/vignettes and provide feedback on usability.

Rmd includes code and text:
https://usepa.github.io/EPATADA/articles/TADAModule1.html
https://usepa.github.io/EPATADA/articles/TADAModule1_BeginnerTraining.html
https://usepa.github.io/EPATADA/articles/TADAModule1_AdvancedTraining.html
https://usepa.github.io/EPATADA/articles/TADAAssessmentUnitUseCase.html
https://usepa.github.io/EPATADA/articles/TADAModule2.html
https://usepa.github.io/EPATADA/articles/TADAWaterSciConWorkshopDemo.html

Rmd includes text only:
https://usepa.github.io/EPATADA/articles/WQXValidationService.html
https://usepa.github.io/EPATADA/articles/CONTRIBUTING.html

Describe the solution you'd like:

Suggest updates to the vignettes directly via a Pull Request or comments on this issue. Guidance on how to contribute directly to this package through a PR can be found here: https://usepa.github.io/EPATADA/articles/CONTRIBUTING.html. You can reach out to our team with questions via comments on this issue.