fix: set default limit for activity loop to 40

shared/includes/parts/activity.html

@@ -1,7 +1,7 @@
-{% assign limit = include.limit | default: false %}
+{% assign limit = include.limit | default: 40 %}
 
 <div class="divide-y">
-	{% for item in activity %}
+	{% for item in activity limit: limit %}
 	{% assign person = people[forloop.index] %}
 		<div>
 			<div class="row">