Migrate docs to docfx; publish with API

docfx.json

@@ -0,0 +1,37 @@
+{
+  "$schema": "https://raw.githubusercontent.com/dotnet/docfx/main/schemas/docfx.schema.json",
+  "build": {
+    "content": [
+      {
+        "files": [
+          "index.md",
+          "toc.yml",
+          "docs/**/*.{md,yml}"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "bitbadger-doc.png",
+          "favicon.ico"
+        ]
+      }
+    ],
+    "output": "_site",
+    "template": [
+      "default",
+      "modern",
+      "doc-template"
+    ],
+    "globalMetadata": {
+      "_appName": "PDODocument",
+      "_appTitle": "PDODocument",
+      "_appLogoPath": "bitbadger-doc.png",
+      "_appFaviconPath": "favicon.ico",
+      "_appFooter": "Hand-crafted documentation created with <a href=https://dotnet.github.io/docfx target=_blank class=external>docfx</a> by <a href=https://bitbadger.solutions target=_blank class=external>Bit Badger Solutions</a>",
+      "_enableSearch": true,
+      "pdf": false
+    }
+  }
+}