feat(journal): add list of topic for TAPL chapters

journal/tapl_progress.typ

@@ -233,4 +233,67 @@
     diagram,
     caption: [TAPL chapters graph and reading status]
   )
-)
+)
+
+#pagebreak()
+
+= Topics
+
+#let topics = (
+  [Introduction],
+  [Mathematical Preliminaries],
+  [Untyped Arithmetic Expressions],
+  [An ML Implementation of Arithmetic Expressions],
+  [The Untyped Lambda-Calculus],
+  [Nameless Representation of Terms],
+  [An ML Implementation of the Lambda-Calculus],
+  [Typed Arithmetic Expressions],
+  [Simply Typed Lambda-Calculus],
+  [An ML Implementation of Simple Types],
+  [Simple Extensions],
+  [Normalization],
+  [References],
+  [Exceptions],
+  [Subtyping],
+  [Metatheory of Subtyping],
+  [An ML Implementation of Subtyping],
+  [Case Study: Imperative Objects],
+  [Case Study: Featherweight Java],
+  [Recursive Types],
+  [Metatheory of Recursive Types],
+  [Type Reconstruction],
+  [Universal Types],
+  [Existential Types],
+  [An ML Implementation of System F],
+  [Bounded Quantification],
+  [Case Study: Imperative Objects, Redux],
+  [Metatheory of Bounded Quantification],
+  [Type Operators and Kinding],
+  [Higher-Order Polymorphism],
+  [Higher-Order Subtyping],
+  [Case Study: Purely Functional Objects],
+)
+
+#{
+  show text: strong
+  show: align.with(center)
+  grid(
+    columns: 3,
+    align: (center, right, left).map(a => a + horizon),
+    column-gutter: 1em,
+    row-gutter: .6em,
+    ..for (i, topic) in topics.enumerate(start: 1) {
+      let indicator = box(
+        width: 1.8em,
+        height: 1.2em,
+        radius: .2em,
+        fill: state-fills.at(
+          chapters.at(str(i))
+                  .at("state", default: "unread")
+        ),
+        stroke: black
+      )
+      (indicator, str(i), topic)
+    }.flatten()
+  )
+}