Finished writing about REACH

[Issue #1]

REACH and SNAP may be the only central laws to consider when writing
about substitute management mechanisms. However, I still need to
consider other legislations that influence the management of
substitutes. I also need to start writing a section on comparison and
comments about the two central laws.

TODO: Other EU and US laws related to substitute management;
TODO: Comparing and criticizing SNAP and REACH;