Add List Available Zle Keybindings as a Zsh TIL

zsh/list-available-zle-keybindings.md

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+# List Available Zle Keybindings
+
+Unlike `bash` which uses `readline`, `zsh` has its own implementation of a line
+editing library -- `zle`. A lot of the core bindings between the two are the
+same, e.g. `Ctrl-a` and `Ctrl-e` to go the beginning and end of the command line
+prompt, respectively.
+
+All available `zle` keybindings can be listed out by running `bindkey` without
+any arguments.
+
+The best way to check out an unaltered version of this list is by starting a
+fresh `zsh` process with no RCS files loaded in. The `-f` flag does that. Note
+though that when `zsh` is starting fresh, it has to decide whether to start in
+_Emacs_ mode or _Vi_ mode. If it sees that your default editor is something like
+`vi`, `vim` or `nvim`, then it will start you in _Vi_ mode.
+
+Starting in _Vi_ mode can be confusing because none of the standard _Emacs_
+keybindings like `Ctrl-a` and `Ctrl-e` are available in that context. So first
+ensure you're in _Emacs_ mode by running:
+
+```sh
+❯ zsh -f
+lastword% bindkey -e
+```
+
+Now you can list out all the keybindings:
+
+```sh
+lastword% bindkey
+"^@" set-mark-command
+"^A" beginning-of-line
+"^B" backward-char
+"^D" delete-char-or-list
+"^E" end-of-line
+"^F" forward-char
+"^G" send-break
+"^H" backward-delete-char
+"^I" expand-or-complete
+"^J" accept-line
+"^K" kill-line
+...
+```
+
+See `man zshzle` for more details on `zle` and `bindkey`.