documents and examples

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

According to our policy, main branch of kube-prometheus should support
the 2 latest versions of Kubernetes. These changes update the tests and
the compatibility matrix to reflect that.

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

Signed-off-by: paulfantom <pawel@krupa.net.pl>

Signed-off-by: paulfantom <pawel@krupa.net.pl>

raised the version of kube-prometheus to 0.7 in the customizing
kube-prometheus installing section

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

Signed-off-by: ArthurSens <arthursens2005@gmail.com>

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

Signed-off-by: paulfantom <pawel@krupa.net.pl>

I've tripped on this while trying to compile kube-prometheus manifests. 

Ref: https://github.com/prometheus-operator/kube-prometheus/issues/902

Signed-off-by: paulfantom <pawel@krupa.net.pl>

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

This change documents where to find documentation and support for the
various components of kube-prometheus.

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Signed-off-by: Kemal Akkoyun <kakkoyun@gmail.com>

fix typo.