doc/tutorial/basics: add per-page chapter headings

Change-Id: I9e0a6b5d1a1c820081b3f87c3871068ea042f889
diff --git a/doc/tutorial/basics/bytes.md b/doc/tutorial/basics/bytes.md
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@@ -1,5 +1,7 @@
 [TOC](Readme.md) [Prev](stringlit.md) [Next](scopes.md)
 
+_JSON Sugar and other Goodness_
+
 # Bytes
 
 CUE distinguishes between a `string` and a `bytes` type.