docs(contribution): streamline contribution documentation

move from `contributing.rst` to `docs/contribution.rst`; update index

closes #16

CONTRIBUTING

+see https://discuss-data.pages.gwdg.de/discuss-data/docs/contribution.html
\ No newline at end of file

CONTRIBUTING.rst

-============================
-Contributing to Discuss Data
-============================
-
-As an open source project, Discuss Data welcomes contributions of many forms.
-
-Examples of contributions include:
-
-* Code patches
-* Documentation improvements
-* Bug reports and patch reviews

docs/contribution.rst

-Contribution
-============
+============================
+Contributing to Discuss Data
+============================
 
-TODO: add information on how to contribute to the project
+As an open source project, Discuss Data welcomes contributions of many forms.
+
+Examples of contributions include:
+
+* Code patches
+* Documentation improvements
+* Bug reports and patch reviews

docs/index.rst

@@ -12,6 +12,7 @@ Table of Contents:
    :maxdepth: 2
 
    requirements
+   contribution
 
 
 Indices & Tables