Implemented group image upload

pages/groups/popular.go

@@ -0,0 +1,22 @@
+package groups
+
+import (
+	"sort"
+
+	"github.com/aerogo/aero"
+)
+
+// Popular shows the most popular groups.
+func Popular(ctx *aero.Context) string {
+	groups := fetchGroups()
+
+	sort.Slice(groups, func(i, j int) bool {
+		if len(groups[i].Members) == len(groups[j].Members) {
+			return groups[i].Created > groups[j].Created
+		}
+
+		return len(groups[i].Members) > len(groups[j].Members)
+	})
+
+	return render(ctx, groups)
+}