Update linux keybinds (#12822)

Release Notes:
- Add `ctrl-y` for Redo.
- Reorder bindings for copy/paste Fixes #11912
- Update `ctrl-b` to show hide left dock. This is the default behavior
in VSCode.


![image](https://github.com/zed-industries/zed/assets/22079654/e0cc6c0e-81df-443f-b77c-9a96370b6cb4)

### Or...

Release Notes:

- N/A

assets/keymaps/default-linux.json

@@ -51,10 +51,11 @@
       // "alt-h": "editor::DeleteToPreviousWordStart",
       // "alt-d": "editor::DeleteToNextWordEnd",
       "ctrl-x": "editor::Cut",
-      "ctrl-c": "editor::Copy",
       "ctrl-insert": "editor::Copy",
-      "ctrl-v": "editor::Paste",
+      "ctrl-c": "editor::Copy",
       "shift-insert": "editor::Paste",
+      "ctrl-v": "editor::Paste",
+      "ctrl-y": "editor::Redo",
       "ctrl-z": "editor::Undo",
       "ctrl-shift-z": "editor::Redo",
       "up": "editor::MoveUp",
@@ -419,7 +420,7 @@
       "alt-8": ["workspace::ActivatePane", 7],
       "alt-9": ["workspace::ActivatePane", 8],
       "ctrl-alt-b": "workspace::ToggleLeftDock",
-      "ctrl-b": "workspace::ToggleRightDock",
+      "ctrl-b": "workspace::ToggleLeftDock",
       "ctrl-j": "workspace::ToggleBottomDock",
       "ctrl-alt-y": "workspace::CloseAllDocks",
       "ctrl-shift-f": "pane::DeploySearch",