add graphical explanations of various decentralisation schemes for ikiwiki

the wiki_edit_flow.svg file is slightly changed to make the box
designate the server boundaries so it can be reused in a coherent
manner in the other graphics.

the distributed_wikis page still needs an overhaul to clarify it's
about the third and fourth setups, but that will be easier to do in
separate commits.

1 files changed, 65 insertions, 65 deletions

diff --git a/doc/rcs/git/wiki_edit_flow.svg b/doc/rcs/git/wiki_edit_flow.svg
index 200a3439d..bb83bb115 100644
--- a/doc/rcs/git/wiki_edit_flow.svg
+++ b/doc/rcs/git/wiki_edit_flow.svg
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