extractapi2 (#996)

- **add extract api**
- **Docs**
- **add docs**

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----

> [!IMPORTANT]
> Introduces a new extraction API with documentation and examples,
updates OpenAPI spec, and reorganizes documentation structure.
> 
>   - **New Extraction API**:
> - Added `POST /extract` endpoint in `openapi.yaml` for data extraction
from files using prompts.
> - Supports multiple file uploads and returns extracted data in JSON
format.
>   - **Documentation**:
> - Added `examples.mdx` with code examples for Python, TypeScript,
Ruby, and Go.
> - Updated `docs.yml` to include new `boundary-extraction-api` tab and
navigation structure.
> - Added `summary.mdx` and `extraction-api.mdx` for API overview and
usage.
>   - **Tests**:
> - Minor changes in `test_functions.py` to accommodate new API
features.
>   - **Miscellaneous**:
>     - Updated `turbo.json` to include new build dependencies.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for c177430. It will automatically
update as commits are pushed.</sup>

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docs/assets/styles.css

@@ -15,6 +15,23 @@
 .fern-sidebar-link-container[data-state="active"] .fern-sidebar-link {
   font-weight: 600;
 }
+.fern-header {
+  border: 0px;
+}
+.fern-header-tabs-list {
+  height: 28px;
+  font-size: 12px;
+}
+.fern-header-tabs {
+  height: 32px;
+  max-height: 36px;
+}
+
+.fern-header-tab-button > * {
+  font-size: 12px;
+  /* color */
+  color: #333333;
+}
 
 /* .fern-sidebar-container {
   color: #000000;