This was a great tool but it seems it is no longer maintained, with no
commits since late 2021 [1]. Remove it, capturing static copies of the
SVGs it was generating so we don't lose information. The original
"source" is retained in case we ever want to revive our use of the tool
but that seems unlikely at this point.
[1] https://github.com/blockdiag/blockdiag
Change-Id: Ie3f89730128fdb8beca8bb02312d11516affcbbc
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
00347ca9b7