Initial MKDocs (#285)

docs/docs/reference/checkpoints.md

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+# Checkpoints
+
+
+::: langgraph.checkpoint
+    handler: python
+    options:
+      selection:
+        docstring_style: google
+      rendering:
+        heading_level: 3
+      show_root_toc_entry: false

docs/docs/reference/graphs.md

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+# StateGraph
+
+
+::: langgraph.graph
+    handler: python
+    options:
+      selection:
+        docstring_style: google
+      rendering:
+        heading_level: 3
+      show_root_toc_entry: false

docs/docs/reference/prebuilt.md

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+# Prebuilt 
+
+
+::: langgraph.prebuilt
+    handler: python
+    options:
+      selection:
+        docstring_style: google
+      rendering:
+        heading_level: 3
+      show_root_toc_entry: false