Refactor page routes into multiple submodules

pages/index/grouproutes/grouproutes.go

@@ -0,0 +1,16 @@
+package grouproutes
+
+import (
+	"github.com/aerogo/layout"
+	"github.com/animenotifier/notify.moe/pages/group"
+	"github.com/animenotifier/notify.moe/pages/groups"
+)
+
+// Register registers the page routes.
+func Register(l *layout.Layout) {
+	// Groups
+	l.Page("/groups", groups.Get)
+	l.Page("/group/:id", group.Get)
+	l.Page("/group/:id/edit", group.Edit)
+	l.Page("/group/:id/forum", group.Forum)
+}