* [docs] Change configuration creation instructions
This changes the wording to push people towards creating their own
configuration, without copying the whole example configuration. This
makes it much easier to reconcile necessary configruation changes on
upgrades.
* [docs] Reword container version section
This changes the wording in the Version section to make it more clear
what the risks of a moving tag are. It pushes people to use an explicit
release tag instead.