cronic: add page (#4981)

pages/common/cronic.md

@@ -0,0 +1,8 @@
+# cronic
+
+> Bash script for wrapping cron jobs to prevent excess email sending.
+> More information: <https://habilis.net/cronic/>.
+
+- Call a command and display its output if it returns a non-zero exit code:
+
+`cronic {{command}}`