Install/update packages from get_packages() by number listed

[jhollway]

No description provided.

[henriquesposito]

For now that we only have two packages in the ecosystem, typing the respective number by which a package is listed in the tibble will also work to install/update the package. However, this may need to be updated as more packages are added from different users/organizations.

[henriquesposito]

@jhollway For the qStates and qEnviron packages there is no about description on their GitHub page and, thus, the description column returns NA in the tibble when running get_packages(). The tibble looks as if the function is not properly working due to the NAs, though it seems that I do not have permission to change these about description. Should we change these to a short sentence that describes the package? Thank you.