dolphin: add page (#5833)

* dolphin: add page

* Apply suggestions from code review

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* Update pages/linux/dolphin.md

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* Update pages/linux/dolphin.md

Co-authored-by: marchersimon <50295997+marchersimon@users.noreply.github.com>

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>
Co-authored-by: marchersimon <50295997+marchersimon@users.noreply.github.com>

pages/linux/dolphin.md

@@ -0,0 +1,32 @@
+# dolphin
+
+> KDE file manager.
+> More information: <https://apps.kde.org/dolphin/>.
+
+- Launch Dolphin:
+
+`dolphin`
+
+- Launch Dolphin and display a specific directory:
+
+`dolphin {{path/to/directory}}`
+
+- Launch Dolphin with a specific file or directory selected:
+
+`dolphin --select {{path/to/file_or_directory}}`
+
+- Launch Dolphin in a separated window:
+
+`dolphin --new-window`
+
+- Launch Dolphin in split view:
+
+`dolphin --split`
+
+- Start the Dolphin daemon (only required to use the DBus interface):
+
+`dolphin --daemon`
+
+- Display help:
+
+`dolphin --help`