omf: add page

pages/common/omf.md

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+# omf
+
+> Oh My Fish, the Fishshell Framework.
+> Install packages to extend and modify the fish shell.
+
+- Install one or more packages:
+
+`omf install {{name}}`
+
+- List installed packages:
+
+`omf list`
+
+- List available themes:
+
+`omf theme`
+
+- Apply a theme:
+
+`omf theme {{name}}`
+
+- Remove a theme or package:
+
+`omf remove {{name}}`
+
+- Uninstall Oh My Fish:
+
+`omf destroy`