openbsd: add directory; openbsd/pkg_{add,info,delete}: add page (#10698)

* openbsd: add directory; openbsd/pkg_{add,info,delete}: add page (#10698) 

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/openbsd/pkg_delete.md

@@ -0,0 +1,17 @@
+# pkg_delete
+
+> Remove packages in OpenBSD.
+> See also: `pkg_add`, `pkg_info`.
+> More information: <https://man.openbsd.org/pkg_delete>.
+
+- Delete a package:
+
+`pkg_delete {{package}}`
+
+- Delete a package, including its unused dependencies:
+
+`pkg_delete -a {{package}}`
+
+- Dry-run deletion of a package:
+
+`pkg_delete -n {{package}}`