paccache: add page (#2788)

pages/linux/paccache.md

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+# paccache
+
+> A flexible pacman cache cleaning utility.
+
+- Remove all but the 3 most recent package versions from the pacman cache:
+
+`paccache -r`
+
+- Set the number of package versions to keep:
+
+`paccache -rk {{num_versions}}`
+
+- Perform a dry-run and show the number of candidate packages for deletion:
+
+`paccache -d`
+
+- Move candidate packages to a directory instead of deleting them:
+
+`paccache -m {{path/to/directory}}`