templates: hide dashboard org creation when not allowed (#5393)
templates: hide dashboard org creation when not allowed (#5393)

The admin -> DISABLE_REGULAR_ORG_CREATION setting
hides organization creation in the header, but not
in the dashboard.
mukaiu/gogs,gogits/gogs,gogits/gogs,chriswatt/gogs,mukaiu/gogs,gogits/gogs,mukaiu/gogs,chriswatt/gogs,chriswatt/gogs