Chart: Readme contains instructions for chart installation from a local directory

[kastl-ars]

The chart's README contains instructions for installing the chart from a local clone of this repository:

helm install planka . --set secretkey=$SECRETKEY \
[...]

https://github.com/plankanban/planka/blob/master/charts/planka/README.md?plain=1#L49

This is correct in the "Local Building and Using the Chart" section, but otherwise I would align with the official documentation which contains the "correct" command, i.e. one that newbies can use to install the command without cloning the repo.

helm install planka planka/planka --set secretkey=$SECRETKEY  \
[...]

Kind Regards, Johannes