deborphan: add page (#6921)

pages/linux/deborphan.md

@@ -0,0 +1,16 @@
+# deborphan
+
+> Display orphan packages on operating systems using the APT package manager.
+> More information: <https://manpages.debian.org/latest/deborphan/deborphan.html>.
+
+- Display library packages (from the "libs" section of the package repository) which are not required by another package:
+
+`deborphan`
+
+- List orphan packages from the "libs" section as well as orphan packages that have a name that looks like a library name:
+
+`deborphan --guess-all`
+
+- Find packages which are only recommended or suggested (but not required) by another package:
+
+`deborphan --nice-mode`