Add periodic cache cleaner prevent slowdowns

src/nitter.nim

@@ -3,7 +3,7 @@ from net import Port
 
 import jester
 
-import types, config, prefs, formatters
+import types, config, prefs, formatters, cache
 import views/[general, about]
 import routes/[
   preferences, timeline, status, media, search, rss, list,
@@ -25,6 +25,8 @@ createMediaRouter(cfg)
 createEmbedRouter(cfg)
 createRssRouter(cfg)
 
+asyncCheck cacheCleaner()
+
 settings:
   port = Port(cfg.port)
   staticDir = cfg.staticDir