Optional features to consider

[rebeccanash]

• Function documentation (this was done before you added yours @PaulC91, but seems we're in agreement!)
• Draft vignette to give an overview of the epishiny structure. We thought that this would help contributors who are less familiar with shiny app structure to modify modules and make other changes.
• Update CFR estimates so that they are made from cumulative incidence to make it smoother.
• Add new option for the person module so that you can visualise the pyramid by proportion of cases in each age group.

For more feedback on this, please see: epiverse-trace#5 and epiverse-trace#3

Please feel free to take or leave these suggestions! Great work!