Add "app" and "staging" to subdomains that return atlas routes

[azvoleff]

Right after this line

resilienceatlas-react/src/views/routes/index.js

Line 12 in 14da680

subdomain.toLowerCase() !== 'staging-cigrp'

add "app" and "staging" as subdomains that should return atlas routes. Like this issue, this should help fix some of the issues we are having with the testing server. And can similarly remove "staging-cigrp" from the list.