improve docs

docs/source/03-UI-Keyboard-Shortcut/index.rst

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+UI Keyboard Shortcut
+==============================================================================
+- ⬆️: tap ``Ctrl + E`` or ``UP`` to move item selection up.
+- ⏫: tap ``Ctrl + R`` to scroll item selection up.
+- ⬇️: tap ``Ctrl + D`` or ``DOWN`` to move item selection down.
+- ⏬: tap ``Ctrl + F`` to scroll item selection down.
+- ⬅️: tap ``LEFT`` to move query input cursor to the left.
+- ➡️: tap ``RIGHT`` to move query input cursor to the right.
+- ⬅️: tap ``LEFT`` to move query input cursor to the left.
+- ➡️: tap ``RIGHT`` to move query input cursor to the right.
+- ⏪: tap ``Alt + LEFT`` to move query input cursor to the previous word.
+- ⏩: tap ``Alt + Right`` to move query input cursor to the next word.
+- ⏮️: tap ``HOME`` to move query input cursor to the beginning of the line.
+- ⏭️: tap ``RIGHT`` to move query input cursor to the end of the line.
+- ◀️: tap ``Ctrl + K`` to delete the previous word.
+- ▶️: tap ``Ctrl + L`` to delete the next word.
+- ↩️: tap ``Ctrl + X`` to clear the query input.
+- ◀️: tap ``BACKSPACE`` to delete query input backward.
+- ▶️: tap ``DELETE`` to delete query input forward.
+- 🔴: tap ``Ctrl + C`` to quit the app.
+- ⤴️: tap ``F1`` to quit the current sub session and go back to the .
+
+User defined action:
+
+- 🚀: tap ``Enter`` to perform custom user action.
+- 🚀: tap ``Ctrl + A`` to perform custom user action.
+- 🚀: tap ``Ctrl + W`` to perform custom user action.
+- 🚀: tap ``Ctrl + U`` to perform custom user action.
+- 🚀: tap ``Ctrl + P`` to perform custom user action.