Update SpO2 and Temp ranges

[gracepotma]

From interviewing a Pediatrician yesterday, Veronica and I learned that we needed to update accordingly:

• Make SpO2 ranges less sensitive (reduced lows by several points)
• Make Temperature ranges more sensitive. E.g. he is finding in practice that temps of 38 in children are often overlooked, and would like this to be flagged.
• Add a new Temperature category for children <3 months old. Apparently before the 3 month mark, a temperature of 38 is treated very differently to a temperature of 38.1. (E.g. a temp of specifically 38.1 or higher in a <3mo old infant triggers very invasive tests like spinal fluid sampling with a large needle.)

Source information sheet: https://docs.google.com/spreadsheets/d/1-afKi0PFI_ySQxuXKN0OTwYgU29WiMAZcy-k7SSZYN4/edit?gid=958690794#gid=958690794