Use modern material theme for docs (#5035)

* Use modern material theme for docs

* Update mkdocs.yml

Added search plugin

Co-authored-by: James Collins <collijk@uw.edu>

* Updating mkdocs material theme config per recommendations to enable all markdown options

* Updated highlight extension settings
and codeblocks throughout the docs to align with mkdocs-material recommendations.

codehilite is deprecated in favor of the highlight extension:
https://squidfunk.github.io/mkdocs-material/setup/extensions/python-markdown-extensions/#highlight

---------

Co-authored-by: lc0rp <2609411+lc0rp@users.noreply.github.com>
Co-authored-by: James Collins <collijk@uw.edu>
Co-authored-by: Nicholas Tindle <nick@ntindle.com>

docs/_javascript/mathjax.js

@@ -0,0 +1,16 @@
+window.MathJax = {
+    tex: {
+        inlineMath: [["\\(", "\\)"]],
+        displayMath: [["\\[", "\\]"]],
+        processEscapes: true,
+        processEnvironments: true
+    },
+    options: {
+        ignoreHtmlClass: ".*|",
+        processHtmlClass: "arithmatex"
+    }
+};
+
+document$.subscribe(() => {
+    MathJax.typesetPromise()
+})