docs: minor edits and link to github editor
docs: minor edits and link to github editor

albertcrowley/project-open-data-dashboard,dhootha/project-open-data-dashboard,mchelen/project-open-data-dashboard,mchelen/project-open-data-dashboard,mchelen/project-open-data-dashboard,albertcrowley/project-open-data-dashboard,albertcrowley/project-open-data-dashboard,dhootha/project-open-data-dashboard,dhootha/project-open-data-dashboard