docs: add index reference

RI-imaging · Mar 14, 2018 · e19cc80 · e19cc80
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commit e19cc80
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diff --git a/docs/index.rst b/docs/index.rst
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 qpformat documentation
 ======================
 
+.. _index:
+
 Qpformat is a Python3 library for opening quantitative
 phase imaging data file formats. This is the
 documentation of qpformat version |release|.