docs: improve the bandwidth manager page
docs: improve the bandwidth manager page

Attempts to make the "Bandwidth Manager" page more user-friendly by
deploying a server pod and a client pod that is guaranteed to not be
colocated with the former. Also provides friendlier commands for
making the 'netperf' test, as well as to check the status of the
bandwidth manager.

Signed-off-by: Bruno Miguel Custódio <69381c3e8d814a4004d0c4f997287589bd37cfde@gmail.com>

tklauser/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium