### Summary
Explicitly replaces all old docs pages with a link to the new docs. This
was required because 404 redirects didn't work for pages that previously
existed, though they worked non-existing paths that never existed.
To test:
> cd docs && make html
Changelogs:
* Added verbiage about the cap limit and data usage for the Freemium AP
* Added deprecated warning on Staging bricks
* Added warning and code examples to use the SaaS API Endpoints using
CLI-vs-SDKs
* Fixed example page formatting
* Added deprecation warning on ``model_name`` param in favor of
``hi_res_model_name``
* Added ``extract_images_in_pdf`` usage and code example in
``partition_pdf`` section
* Reorganized and improved the documentation Intro section
This PR adds documentation of models supported by the `Unstructured`
tool. The changes reflect the tool's capabilities, usage examples, and
the process for integrating custom models.
Sections:
- Detailed the basic usage of the `Unstructured` partition with the
model name.
- Provided a list of available models in the `Unstructured` partition.
- Added instructions on using non-default models via three distinct
methods.
- Explained leveraging models from the LayoutParser's model zoo with
`UnstructuredDetectronModel`.
- Guided users in integrating their custom object detection models using
the `UnstructuredObjectDetectionModel` class.
Tested the docs build with:
> cd docs
> pip install -r requirements.txt
> make html
