Since we exported help texts into text files, we are no longer able to
refer to the user's key bindings. Drop key binding references from the
online help texts.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
Move the texts of each online help screen to a separate text file. The
set of files is supposed to replace the online help screens later.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
