eclean: add page (#15007)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/linux/eclean.md

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+# eclean
+
+> Clean repository source files and binary packages.
+> More information: <https://wiki.gentoo.org/wiki/Eclean>.
+
+- Clean the source file directory:
+
+`sudo eclean distfiles`
+
+- Clean the binary package directory:
+
+`sudo eclean packages`
+
+- Clean the distfiles of all uninstalled packages, but keep the distfiles of installed packages:
+
+`sudo eclean --deep --package-names distfiles`
+
+- Clean the binary packages of all uninstalled packages, but keep the binaries of installed packages:
+
+`sudo eclean --deep --package-names packages`