Updated docs/bash and docs/readline

  * bash/profile.org: don't input GPG key, very annoying, instead use
    readline keybind;
  * readline/readline.org: define new keybind: 'C-x g' to run keychain
    with given (hard-coded) GPG key;
  * profile.d/{,l}05keychain: updated;
  * readline/inputrc: updated.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>