preliminary implementation of full network graph as chord diagram [#53804845]
revise ego-graph of people directly conneted to belfast group, and link from full network page [#52558815]
clean up chord diagram code & presentation [#53804845]
Merge branch 'feature/d3-chord-diagram' into develop
fix top-level network link in site base nav
link from full network graph page to chord diagram [#53804845]