few more docs

Hi,

although I might touch these sources again tomorrow, I thought it's good to open a PR in order to receive early feedback (mostly of crude type about missing pieces/paragraphs). Yet, any feedback is welcome :)

tia, F.
Change to: `By default, the packages themselves ...`.

Remove existing `by default` in the whole paragraph.

At the end, add: Different configuration options are available for changing the default behaviour, i.e., `--subdir-software`, `--subdir-modules`, `--module-naming-scheme`, etc.