vkpurge: add page (#10385)

pages/linux/vkpurge.md

@@ -0,0 +1,17 @@
+# vkpurge
+
+> List or remove old kernel versions left behind by `xbps`.
+> The `version` arguments support shell globs.
+> More information: <https://man.voidlinux.org/vkpurge.8>.
+
+- List all removable kernel versions (or those matching `version` if the argument is specified):
+
+`vkpurge list {{version}}`
+
+- Remove all unused kernels:
+
+`vkpurge rm all`
+
+- Remove kernel versions matching `version`:
+
+`vkpurge rm {{version}}`