add listing page for permutations

posts/permutations/_metadata.yml

@@ -0,0 +1,5 @@
+# freeze computational output
+freeze: auto
+
+# Enable banner style title blocks
+title-block-banner: true

posts/permutations/index.qmd

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+---
+title: "A Game of Permutations"
+listing:
+  contents: .
+  sort: "date"
+---
+
+Articles about diagrams at the intersection between graph theory and group theory.
+
+Publication dates correspond to the original WordPress publication dates.