update the homepage to describe that the fabric8 platform is mothballed

[jstrachan]

while some repos have activity (fabric8-maven-plugin, kubernetes-client) the fabric8-platform hasn't had a release in a very long time (July 2017!) - so we should describe that its no longer being maintained on the home page
http://central.maven.org/maven2/io/fabric8/platform/distro/distro/

[jstrachan]

cc @maxandersen

[rawlingsj]

Any chance we can get something up soon please? Folks are still trying to install fabric8 and it's not fair to them wasting their time.

[maxandersen]

I know - working on it.

[jstrachan]

@maxandersen why is it taking so long to write one sentence on the home page?

[rawlingsj]

@maxandersen any updates on this? fabric8io/gofabric8#648

[maxandersen]

Done - sorry for the wait.