add site-specificity to data loading code

[seqasim]

Sometimes we record across different hospitals, which have different naming conventions etc. Either there should be one universal solution to loading this code (lol) or we should have site as an input to functions that load code with if condns to do site-specific data wrangling

[seqasim]

In the event that certain steps for a site need to be performed manually or offline, make a readme document for that site detailing these steps.