Adds mathjax

Description

Mathjax was added to render complex formulas correctly. It will render only formulas within the html class mathjax-render.

It is used in the ecological_assesment documentation in this MR

Screenshots/Logs

Attach screenshots or log outputs if applicable.

Testing Instructions

1. Compare screenshots with old documentation of ecolgical_assessment (in Basic Concepts / Dallara / General Principles)
2. Use mkdocs to build new version
3. Check whether formulas are correct rendered

Developer Checklist

• Code has been tested locally and/or in pipeline.
• (if applicable) documentation updated.
• (if applicable) impact of new dependencies reviewed and included in project.
• Merge conflicts resolved with the target branch.

docs/assets/javascripts/mathjax.js

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