bind: add page (#14084)

pages/common/bind.md

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+# bind
+
+> Bash builtin to manage bash hotkeys and variables.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#Bash-Builtins>.
+
+- List all bound commands and their hotkeys:
+
+`bind {{-p|-P}}`
+
+- Query a command for its hotkey:
+
+`bind -q {{command}}`
+
+- Bind a key:
+
+`bind -x '"{{key_sequence}}":{{command}}'`
+
+- List user defined bindings:
+
+`bind -X`
+
+- Display help:
+
+`help bind`