removed md extension from all internal file links

README.md

_config.yml

docs/CONTRIBUTING.md

docs/ambassadors/expectations.md

docs/ambassadors/goals.md

docs/community.md

docs/community/community-goals.md

docs/community/community-who.md

docs/community/mountain-of-engagement.md

...ommunity/pathways-1-barriers-and-solutions-educational.md

...mmunity/pathways-1-barriers-and-solutions-experiential.md

...ommunity/pathways-1-barriers-and-solutions-inclusivity.md

...mmunity/pathways-1-barriers-and-solutions-motivational.md

docs/community/personas-and-pathways-descriptions.md

docs/community/personas-and-pathways.md

docs/community/roadmap.md

docs/contact.md

docs/events/doc-hack-1.md

docs/events/doc-hack-template.md

docs/open-leadership.md