remove hallucinated keybinding

Author: kommander

packages/web/src/content/docs/keybinds.mdx

@@ -144,7 +144,6 @@ The OpenCode desktop app prompt input supports common Readline/Emacs-style short
 | `ctrl+u` | Kill to start of line                    |
 | `ctrl+w` | Kill previous word                       |
 | `alt+d`  | Kill next word                           |
-| `ctrl+y` | Yank (paste) last killed text            |
 | `ctrl+t` | Transpose characters                     |
 | `ctrl+g` | Cancel popovers / abort running response |