[DOCS] adjust contribution guide -dev (open-edge-platform#193) (open-edge-platform#198)

* [DOCS] adjust contribution guide -dev

* Update docs/developer-guide/emt-contribution.md



* Update docs/developer-guide/emt-contribution.md

* fix links

* Update emt-contribution.md

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Co-authored-by: Anuj Mittal <anuj.mittal@intel.com>
Co-authored-by: Sebastian Golebiewski <sebastianx.golebiewski@intel.com>

Author: 3 people