Add helm chart (#107)

* Add loki helm chart

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Add promtail helm chart

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Update loki conf from comment

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Update promtail conf from comment

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Update values from comment

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* adding resources limit and request

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* update README

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* rename to daemonset promtail

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* use masger for loki

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Move into production repo, re-add readme.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

* Move to production folder

Signed-off-by: Julien Garcia Gonzalez <julien@giantswarm.io>

* Review feedback; add instructions for installing Grafana with helm.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>