Add robots.txt to static/ of 'phylesystem' webapp
Add robots.txt to static/ of 'phylesystem' webapp

This is now the preferred (and more likely) default app, since it will
return a minimal JSON response with links to API docs and code.

OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree