[docs] switch generated docs to MkDocs

docs/javascripts/mathjax.js

@@ -0,0 +1,19 @@
+window.MathJax = {
+  loader: {
+    load: ["input/tex-full", "output/chtml"]
+  },
+  tex: {
+    processEscapes: true,
+    processEnvironments: true
+  },
+  options: {
+    ignoreHtmlClass: ".*|",
+    processHtmlClass: "arithmatex"
+  }
+};
+
+document$.subscribe(() => {
+  MathJax.typesetPromise?.(
+    document.querySelectorAll(".arithmatex")
+  ).catch((error) => console.error(error));
+});