Add a form to add data visualization dashboards to a city

[cdparra]

in https://www.denguechat.org/organizations/territorio add a button that would open a form to add one or more data visualization dashboards that are publicly available somehwere else.

Show each different dashboar under a tab of this page.

Consider moving the whole "territory" section to to the page under Datos (https://www.denguechat.org/dashboard/visits)