Expose a simple HTML representation of the /healths endpoint

[sganslandt]

bootstrap?

• [x] Try out services as panels, and nodes as panels within panels
• [x] Don't show healths by default, if they're healthy
• [ ] Remove role until it has any real meaning

[sganslandt]

Reopening this one... Even I can probably make it a bit more pretty :)

[sganslandt]

Ok, done for now.