This lets Janet be a better unix citizen and lets Ctrl-C
raise an interrupt. Trying to make Janet behave superficially
like a shell by overriding Ctrl-C is not helpful.
* I deleted Alt-H and Alt-L because Ctrl-F and Ctrl-B serve the same
roles.
* Ctrl-W, Alt-D, Alt-F, and Alt-B behave more similarly to the same
key bindings on GNU readline.
* Improved documentation of REPL keybindings on man page.
* Home and End keys now work on more terminal environments.
* Removed bindings for `Esc OH` and `Esc OF` because andrewchambers
doesn't need those bindings and the bindings don't seem to make much
sense for Home and End. `Esc O` is Single Shift Select of G3 Character
Set in xterm. https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
