cliphist: add page (#18684)

pages/linux/cliphist.md

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+# cliphist
+
+> Manage clipboard history for Wayland compositors.
+> Works with `wl-copy` and `wl-paste`.
+> More information: <https://github.com/sentriz/cliphist>.
+
+- List clipboard history entries:
+
+`cliphist list`
+
+- Select and copy a previous clipboard entry (using `fzf`):
+
+`cliphist list | fzf | cliphist decode | wl-copy`
+
+- Delete all stored clipboard entries:
+
+`cliphist wipe`
+
+- Delete a specific clipboard entry by ID:
+
+`cliphist delete {{id}}`
+
+- Save the current clipboard content manually:
+
+`wl-paste | cliphist store`