and GIT_SUBMODULE_STRATEGY as the suggested values are already used as
the default values, document instead in Design section (next commit)

We also clarify the procedure a little by avoiding the use of nano,
among other things. It might come as a surprise, but nano is not
really intuitive or easy to use for some people, use the lowest common
denominator instead (cat).

Update schleuder.md with more detailed email command instructions.

See merge request !22

Those can still be useful as a disaster recovery mechanism.

This reverts commit deb01b72.

This is to please the linter, but it is also to make it look correctly
indented in the rendered version.