Since blockdiag seems a bit unmaintenained, let's just statically
generate the SVGs but let's keep the source files in tree so we can
modify the diagrams whenever we want, provided blockdiag exists in
a foreseenable future :-)
Closes-Bug: #2026345
Change-Id: I1cc078554ab149a9849c895e08c878180b7510b0
cc25813b6d
