add weekly pages

schedule.md

@@ -4,6 +4,7 @@ title: Schedule
 description: The weekly schedule and list of topics.
 nav_order: 3
 nav_exclude: false
+has_children: true
 ---
 
 <!-- Note that it is possible to assign flashy colours to the different kinds of events by editing `_sass/custom/schedule.scss` (N.B.: they match with the colours under the “Modules” tab!).

weeks/week_1_1.md

+---
+layout: page
+title: Week 1.1
+nav_order: 1
+description: Overview of the week.
+parent: Schedule
+---
+
+# Overview of Week 1.1
+
+Text.
\ No newline at end of file