docs: use logo from assets

Symlink the docs logo to the canonical assets location.  It looks like
it does the sensible thing and de-references the source symlink when
building, as doc/build/html/_static/opendev.svg ends up as the actual
file, not a symlink.

Change-Id: I4409c8e20601bdcb9e387d028b5df13c90d1ffa0

doc/source/_static/opendev.svg

@@ -1,86 +0,0 @@
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doc/source/_static/opendev.svg

@@ -0,0 +1 @@
+../../../assets/opendev.svg