Add sitemap and styles for Persian font integration

- Created a new sitemap.xml file for better SEO.
- Added a compressed version of the sitemap as sitemap.xml.gz.
- Introduced extra.css for custom styles, including Persian font support (IRANSansX).
- Defined font-face rules for regular and bold styles of IRANSansX.
- Implemented various text styles and layout adjustments for better readability.
- Enhanced Mermaid diagram styles to support Persian text rendering.

docs/javascripts/mathjax.js

@@ -0,0 +1,20 @@
+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()
+  })
+