* Adjust header to match _page_title
* Add instructions on deletion of CSRs and setting permissions
* Simplify some path expressions and commands
* Consqeuently use ~ instead of ${HOME}
* Precise formulation ('key' vs. 'public key')
* Fix wrong indentation of output of `openssl req`
* Use dash ('--') instead of minus ('-')
Remark on permissions:
It's not a problem to `chmod 0400` the private keys, because the
Docker daemon runs as root (can read the file anyway) and the Docker
client runs as user.
Signed-off-by: Lorenz Leutgeb <lorenz.leutgeb@gmail.com>