UI cosmetic tweaks

Here's a list of small issues I found during demo preparation:

1. Help => BIND9 Manual links to a broken page (bind9 is broken on rtd)
2. Login page "ver:" => "version"
3. On the hosts page, there should be an information where the host info came from: Kea config file or a database. (taken care of in #246 (closed))
4. Need to add help for hosts (taken care of in #217 (closed))
5. Grafana is a service and should be shown in the Services menu (justification: 1. it is a service, 2. we should save space on the screen, the menu already looks ugly wrapped when doing screenshots on non-full screen)
6. Bind Grafana template should have Stork added to its name (and stork tag), so it would would similar to Kea dhcpv4 dashboard.