docs: Mintlify MDX docs + docs.json; bump Speakeasy to 1.787.0 (#382)

docs/components/anthropicimageblockparamsource.mdx

@@ -0,0 +1,18 @@
+---
+title: "AnthropicImageBlockParamSource"
+---
+
+## Supported Types
+
+### `components.AnthropicBase64ImageSource`
+
+```python
+value: components.AnthropicBase64ImageSource = /* values here */
+```
+
+### `components.AnthropicURLImageSource`
+
+```python
+value: components.AnthropicURLImageSource = /* values here */
+```
+