Expanding support for `bandwidthCeiling`

* fixed mixed content issue
* added task source
* started adding dependencies
* switched to using megabytes
* switched megabytes to unrestricted double (for +Infinity)
* defined bandwidthCeiling and event
* added "steps for getting the bandwidth ceiling"
* defined more clearly "Underlying connection types"
* added empty "Table of maximum theoretical bandwidths"