add dates

dates.md

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+noting here for convenience publication dates (taken from git commits, will add them to documents and index)
+
+2021 (8 posts):
+- Mar 12: arraymancer_tutorial
+- Mar 18: bigints_examples
+- Mar 18: display_multidim_arrays
+- Mar 24: pixie_chessboard
+- Mar 24: random_palette
+- Apr 13: bernulli_and_beyond
+- May 7: mustache_specs
+- May 15: toc_mustache
+
+2022 (12+ posts):
+- Feb 15: mermaid_diagram
+- Mar 31: z3_examples
+- Jul 5: show_plotly
+- Jul 12: city_in_a_bottle
+- Jul 14: balls_in_boxes (later removed)
+- Jul 28: before_after_image_slider
+- Aug 2: trigonometric_plant
+- Aug 2: bouncing_balls_p5js
+- Aug 3: plant_js + plant_app + karax_widgets_demo
+- Oct 20: three_js (not working)
+- Oct 24: vegalite_example
+- Oct 28: hello_name
+- Nov 13: polymorph_js_backend
+- Nov 14: easyess_js_ball