build: initialize docfx

docfx.json

@@ -0,0 +1,46 @@
+{
+  "$schema": "https://raw.githubusercontent.com/dotnet/docfx/main/schemas/docfx.schema.json",
+  "metadata": [
+    {
+      "src": [
+        {
+          "src": "../Heir",
+          "files": [
+            "**/*.csproj"
+          ]
+        }
+      ],
+      "dest": "api"
+    }
+  ],
+  "build": {
+    "content": [
+      {
+        "files": [
+          "**/*.{md,yml}"
+        ],
+        "exclude": [
+          "_site/**"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "output": "_site",
+    "template": [
+      "default",
+      "modern"
+    ],
+    "globalMetadata": {
+      "_appName": "heir-docs",
+      "_appTitle": "heir-docs",
+      "_enableSearch": true,
+      "pdf": false
+    }
+  }
+}

index.md

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+---
+_layout: landing
+---
+
+# Welcome to the Heir docs!
+Here you will find all of the API reference for the Heir codebase.

toc.yml

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+- name: API Reference
+  href: api/