add Macro syntax for argmax and argmin

Author: mmcky

lectures/_config.yml

@@ -26,6 +26,11 @@ sphinx:
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png
       description: This website presents a set of lectures on quantitative economic modeling, designed and written by Thomas J. Sargent and John Stachurski.
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
+    mathjax_config:
+      TeX:
+        Macros:
+          "argmax" : "arg\,max"
+          "argmin" : "arg\,min"
     rediraffe_redirects:
       index_toc.md: intro.md
     tojupyter_static_file_path: ["source/_static", "_static"]