Add more instructions regarding `docs/keyring.rst`. (#624)
Add more instructions regarding `docs/keyring.rst`. (#624)

* Add more instructions regarding `docs/keyring.rst`.

Add minimal explanation for using external password manger named `pass`
to automatically safely and fetch the password.

* Some fixups

untitaker/vdirsyncer,untitaker/vdirsyncer,untitaker/vdirsyncer