GitLab

- change example experiment to pyexps/simple_ping.py
- quickstart.rst: remove repeated information already found in README
- README: add note that simbricks-run is only available in docker containers

- add `Error Opening images/output-base/base.raw`
- move `Getting Help` to the beginning and add content

this gets rid of the non-fatal build error 'No names found, cannot describe anything'

These all do the same thing except with different hosts or NICs. Combine them
in one script running all configurations.
- gem5_i40e_pair
- qemu_i40e_pair
- qemu_e1000_pair

Helps quickly determine available CPU features in host simulators.

Simply installs vanilla simics under sims/external/simics. Because of licensing
restrictions we cannot automatically download simics from the intel page.
Instead the makefile will prompt the user to download to files and add them to
the simics directory.

This commit does not include any simbricks integration at all yet.
Co-authored-by: Antoine Kaufmann <antoinek@mpi-sws.org>