rpmconf: add page (#12127)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: cyqsimon <28627918+cyqsimon@users.noreply.github.com>
Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>

pages/linux/rpmconf.md

@@ -0,0 +1,13 @@
+# rpmconf
+
+> Handle RPMNEW, RPMSAVE and RPMORIG files left over by package upgrades.
+> See also: `rpm`.
+> More information: <https://github.com/xsuchy/rpmconf>.
+
+- List leftover files and interactively choose what to do with each of them:
+
+`sudo rpmconf --all`
+
+- Delete orphaned RPMNEW and RPMSAVE files:
+
+`sudo rpmconf --all --clean`