remove_background: Removes background from absorbance data
In KarenGoncalves/elisaFunctions: What the Package Does (One Line, Title Case)

This function allows you to subtract the background (when it was measured) for all other measures

1 2	remove_background(background, treatments, condition_column, measure_column, plate_column, data)

`background`	string in the condition column that indicates which measures are the blank
`treatments`	vector with strings for each condition/treatment in the study
`condition_column`	name of the column where the conditions are listed
`measure_column`	name of the column where the measures, corrected by removing the background, are recorded
`plate_column`	column in data that indicates from which plate each data comes from
`data`	name of the dataframe with condition_column and measure_column