doc/routeserver: Remove needless figures, centre and tweak other figs

* routeserver.texi: The full-mesh v RS topology diagrammes are fairly obvious
  and don't deserve so much space.  As smaller wrap-floats they might be
  acceptable, but there seems no way to access that TeX feature from
  Texinfo.  So nuke them.

  Centre the 2 other figures. Tweak size to avoid bbox overflow messages.
6 files changed