ensure trailing slashes in all routes

app/routes/topics.py

@@ -10,13 +10,13 @@ def all_topics():
     topic_list = Topics.get_list()
     return render_template('topics/topics.html', topics=topic_list)
 
-@bp.get('/<slug>')
+@bp.get('/<slug>/')
 def topic(slug):
     topic = Topics.find({'slug': slug})
     if not topic:
         abort(404)
     sort_by = request.args.get('sort_by', default=session.get('sort_by', default='activity'))
-    PER_PAGE = 10
+    PER_PAGE = 3
     threads_count = Threads.count({'topic_id': topic.id})
     page_count = max(1, math.ceil(threads_count / PER_PAGE))
     try: