* updating labels descriptions * delete milestones * Update docs/CONTRIBUTING.adoc Co-authored-by: Bastian Köcher <git@kchr.de> * link to label docs * Update docs/CONTRIBUTING.adoc Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> --------- Co-authored-by: Bastian Köcher <git@kchr.de> Co-authored-by: parity-processbot <> Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>