Updated daemon's systemd file, fixed typos in README

@arthurtiteica has pointed out that systemd has more suitable facilities for
creating a temporary directory for a PID file rather than calling  ExecStartPre,
which requires an absolute path to coreutils executables we used for creating a
directory and changing its owner, paths of which are are not universal across
distributions. Systemd can take care of it for us without need to provide
absolute paths, which is what we use here.

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