vagrant: Remove installation of doc. dependencies
vagrant: Remove installation of doc. dependencies

Documentation dependencies are now included in the VM image, since v49
for ubuntu-next and v170 for ubuntu-dev.

Signed-off-by: Paul Chaignon <a027184a55211cd23e3f3094f1fdc728df5e0500@cilium.io>

michi-covalent/cilium,cilium-team/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,cilium-team/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium