docs: update TSDoc configuration to include mermaid plugin and simplify tag definitions

Author: lposen

tsdoc.json

@@ -1,15 +1,5 @@
 {
   "$schema": "https://developer.microsoft.com/json-schemas/tsdoc/v0/tsdoc.schema.json",
-  "extends": ["typedoc/tsdoc.json"],
-  "noStandardTags": false,
-  "tagDefinitions": [
-    {
-      "tagName": "@os",
-      "syntaxKind": "block"
-    },
-    {
-      "tagName": "@mermaid",
-      "syntaxKind": "block"
-    }
-  ]
+  "extends": ["typedoc/tsdoc.json", "typedoc-plugin-mermaid/tsdoc.json"],
+  "noStandardTags": false
 }