unopkg: add page (#14109)

pages/linux/unopkg.md

@@ -0,0 +1,30 @@
+# unopkg
+
+> LibreOffice extensions manager.
+> Download extensions from <https://extensions.libreoffice.org>.
+> See also: `libreoffice`.
+> More information: <https://manned.org/unopkg>.
+
+- Add and deploy given extension:
+
+`unopkg add {{path/to/extension}}`
+
+- Remove extension:
+
+`unopkg remove {{extensions_id}}`
+
+- Display information about deployed extensions:
+
+`unopkg list`
+
+- Raise extensions dialog (GUI):
+
+`unopkg gui`
+
+- Reinstall all deployed extensions:
+
+`unopkg reinstall`
+
+- Display help:
+
+`unopkg {{-h|--help}}`