TypeScript compatibility (#379)

* Update file extensions and exports for TypeScript compatibility

* docs: fix typo in getting-started.md

* chore: add no-trailing-punctuation rule to VS Code settings

* feat: add @docusaurus/theme-mermaid for mermaid diagram support

* Update import paths for MermaidDiagram component

* remove redudndant check, use effect only runs after the component is mounted

* Update docusaurus.config.ts to fix syntax error

* bring back check because it's not possible to properly cancel a dynamic import

* feat: optimize dynamic import in CodeBlock component

* chore: update VS Code extensions.json with eslint recommendation

* Update docusaurus.config.ts to add GitHub repository link in header

vars.ts

@@ -0,0 +1,7 @@
+const vars = {
+  rustVersion: "1.72",
+  actixWebMajorVersion: "4",
+  tokioMajorVersion: "1",
+};
+
+export default vars;