Teach how to update conda before installing any packages

[EdwinB12]

To ensure the demonstrator and all users have the same packages available, the entire class should update conda together: conda update conda

[ns-rse]

According to the documentation by default Conda automatically updates itself... "conda updates itself any time a user updates or installs a package in the root environment." . Would have to make the distinction of running conda update conda under base and any other created and activated environment.

[ns-rse]

Conda automatically updates (see above comment) so don't feel the need to explicitly call this out.