guix-package: add page (#2489)

pages/linux/guix-package.md

@@ -0,0 +1,27 @@
+# guix package
+
+> Install, upgrade and remove Guix packages, or rollback to previous configurations.
+
+- Install a new package:
+
+`guix package -i {{package_name}}`
+
+- Remove a package:
+
+`guix package -r {{package_name}}`
+
+- Search the package database for a regular expression:
+
+`guix package -s "{{search_pattern}}"`
+
+- List installed packages:
+
+`guix package -I`
+
+- List generations:
+
+`guix package -l`
+
+- Roll back to the previous generation:
+
+`guix package --roll-back`