Dependence on `rsync` is not platform agnostic

[connorjbracy]

In the Makefile containing the make functions for updating the site, there are several uses of rsync (i.e., use 1 & use 2) which doesn't seem to be supported on Windows, WSL, nor GitBash making doing the steps for updating the website problematic for members of the group who do not have access to a Linux installation.

This issue is separately documented but would be taken care of by Issue #43