add the MathJax and a math showcase page

docs/assets/javascripts/mathjax.js

@@ -0,0 +1,19 @@
+window.MathJax = {
+  tex: {
+    inlineMath: [["\\(", "\\)"]],
+    displayMath: [["\\[", "\\]"]],
+    processEscapes: true,
+    processEnvironments: true
+  },
+  options: {
+    ignoreHtmlClass: ".*|",
+    processHtmlClass: "arithmatex"
+  }
+};
+
+document$.subscribe(() => { 
+  MathJax.startup.output.clearCache()
+  MathJax.typesetClear()
+  MathJax.texReset()
+  MathJax.typesetPromise()
+})

mkdocs.yml

@@ -104,6 +104,8 @@ markdown_extensions:
         line_spans: __span
         pygments_lang_class: true
    - pymdownx.inlinehilite # highlight inline code blocks
+   - pymdownx.arithmatex:
+        generic: true
 
 
 # plugins
@@ -209,8 +211,8 @@ nav:
    - Jupyter Notebook Showcase: 
        - jupyternb/index.md
        - Plot NBP time series: jupyternb/check_nbp.ipynb
-   #- Test page:
-   #    - test/index.md
+   - Test page:
+       - test/index.md
    - Blog:
        - blog/index.md
 
@@ -223,3 +225,5 @@ extra_css:
 
 extra_javascript:
    - assets/javascripts/change-annotation-icon.js
+   - assets/javascripts/mathjax.js
+   - https://unpkg.com/mathjax@3/es5/tex-mml-chtml.js