readme: Fix relative URL to demo_zbigarray.py
In the time when README.rst was initially introduced (58279ac7 "readme: Initial draft") GitLab was not handling relative links well and it was necessary to construct them properly by hand. Nowdays GitLab automatically adds namespace and project and blob/ref/ prefix to relative URL link, so there is no need to specify them manually. Actually specifying the prefix manually makes URL invalid, as it becomes something like https://lab.nexedi.com/nexedi/wendelin.core/blob/master/wendelin.core/blob/master/demo/demo_zbigarray.py Fix it.
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