Document the `puppet storeconfigs export` command
Document the `puppet storeconfigs export` command

This also forms the beginnings of a migration guide.

mullr/puppetdb,rbrw/puppetdb,jantman/puppetdb,shrug/puppetdb,waynr/puppetdb,grimradical/puppetdb,waynr/puppetdb,ajroetker/puppetdb,highb/puppetdb,kbarber/puppetdb,johnduarte/puppetdb,cprice404/puppetdb,senior/puppetdb,shrug/puppetdb,mullr/puppetdb,grimradical/puppetdb,rbrw/puppetdb,jantman/puppetdb,rbrw/puppetdb,highb/puppetdb,highb/puppetdb,kbrezina/puppetdb,grimradical/puppetdb,kbarber/puppetdb,ajroetker/puppetdb,puppetlabs/puppetdb,melissa/puppetdb,johnduarte/puppetdb,melissa/puppetdb,highb/puppetdb,wkalt/puppetdb,cprice404/puppetdb,melissa/puppetdb,wkalt/puppetdb,jantman/puppetdb,johnduarte/puppetdb,kbrezina/puppetdb,shrug/puppetdb,wkalt/puppetdb,kbarber/puppetdb,wkalt/puppetdb,rbrw/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb,grimradical/puppetdb,kbrezina/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,rbrw/puppetdb,waynr/puppetdb,senior/puppetdb,senior/puppetdb,puppetlabs/puppetdb,johnduarte/puppetdb,waynr/puppetdb,ajroetker/puppetdb,senior/puppetdb,kbrezina/puppetdb,shrug/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,ajroetker/puppetdb,cprice404/puppetdb