Add and document Graphana web origin to relm template

<tsegismont> So to enable requests from Grafana UI, I should simply log into KC and configure allowed origins?
<jpkroehling> right
<jpkroehling> if you want, we can add the origin to KC by default
<jpkroehling> https://github.com/hawkular/hawkular-accounts/blob/master/feature-pack/src/main/resources/content/standalone/configuration/hawkular-realm-for-dev.json#L91
<jpkroehling> tsegismont, we have one already for port 2772 , which is jasmine javascript tests, IRIC
<jpkroehling> IIRC
<tsegismont> that would be awesome
<jpkroehling> I assume it runs on localhost, on a separate port, right ?
<jpkroehling> which port is that ?
<tsegismont> the port advised by Grafana is port 3000