Secure key storage

Closes privatestorageops#193

See merge request !86

Add local development network morph/nix configuration

See merge request !82

Fix (make-)issuer.nix file name inconsistency

See merge request !84

Discern make-issuer.nix from issuer.nix better.

Update branch by merging @jcalderone's feedback on local-dev-env-2.

Add local development network Vagrantfile and Documentation

See merge request !81

... if other hypervisors are installed as well.

Co-Authored-By: Jean-Paul Calderone <jean-paul@privatestorage.io>

This updates this MR to the latest base branch (develop) and also
is an experiment on what happens when I merge instead of rebase to
update MRs.

Create documentation artifacts

See merge request !80

Using a copy of the docs artifacts for packing up
should not exhibit the problems from earlier.

Remove user documentation

See merge request !79