Add nested summaries for newer courses (#2425)

docs/courses/logic-lab/SUMMARY.md

@@ -0,0 +1,8 @@
+# [Logic Lab](/courses/logic-lab)
+
+* [Logic Lab](/courses/logic-lab)
+    * [Logic and Expressions](/courses/logic-lab/expressions)
+    * [Boolean Elements](/courses/logic-lab/elements)
+    * [Logic Explorer](/courses/logic-lab/explorer)
+    * [Logic Gates](/courses/logic-lab/logic-gates)
+    * [Programmable Logic](/courses/logic-lab/programmable)