Without this, it's possible that the helm chart documentation
contains the `image tag` version which might not be equal to
the version in the helm chart, as it's only an example.

This is a confusing, so instead we should use make to edit the
application version everywhere.

This fixes it by updating the Makefile to modify text of the
chart's README using a regex looking for something similar to
a version; then I used the updated makefile to edit the README,
which in turns requires a bump of the version of the chart
itself.