chg: Add config for archive

config/generic.json.sample

@@ -43,6 +43,7 @@
     }
   },
   "hide_captures_with_error": false,
+  "archive": 180
   "_notes": {
     "loglevel": "(lookyloo) Can be one of the value listed here: https://docs.python.org/3/library/logging.html#levels",
     "splash_loglevel": "(Splash) INFO is *very* verbose.",
@@ -66,6 +67,7 @@
     "enable_mail_notification": "Allow users to notify a pre-configured email address about a specific capture",
     "email": "Configuration for sending email notifications.",
     "priority": "Define the priority of a new capture. A capture from the web interface has priority over a capture from the API, same for authenticated user vs. anonymous.",
-    "hide_captures_with_error": "Capturing an URL may result in an error (domain non-existent, HTTP error, ...). They may be useful to see, but if you have a public instance, they will clutter the index."
+    "hide_captures_with_error": "Capturing an URL may result in an error (domain non-existent, HTTP error, ...). They may be useful to see, but if you have a public instance, they will clutter the index.",
+    "archive": "The captures older than this value (in days) will be archived. They're not cached by default in the Lookyloo class."
   }
 }