* Remove Tiller reference from the docs

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

* Update comments after review

- https://github.com/helm/helm/pull/4788#discussion_r226037034
- https://github.com/helm/helm/pull/4788#discussion_r226037064
- https://github.com/helm/helm/pull/4788#discussion_r226037806
- https://github.com/helm/helm/pull/4788#discussion_r226038492
- https://github.com/helm/helm/pull/4788#discussion_r226039202
- https://github.com/helm/helm/pull/4788#discussion_r226039894



Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

(cherry picked from commit a8023164)

(cherry picked from commit 14af25f1)

There should be a colon because it precedes an explanation or an enumeration, or list.

(cherry picked from commit a4f965e0)

Also bumps the release version to v2.6.1.

they are currently set to 2.4.1.

The current README makes no mention of the Chart repository or where to find it. You have to Google to find it or stumble upon it. It was frustrating to come to the Helm project and not easily be able to find where the chart repository was - even though I knew it existed. This patch will make that easier for others.

This removes the full TOC from the README and puts it in an index. This
will help when we begin to autogenerate a website based on
documentation.

To exit incubation the roadmap needs to be listed in the wiki per
the incubator documentation. For more detail see
https://github.com/kubernetes/community/blob/master/incubator.md

Closes #1482