### 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
Documentation Overhaul
- Added documentation hierarchy
- Added options for Bash vs Python for API & Upstream Connectors
- Added Introduction section (Overview, Key Concepts, Getting Started)
- Redid connectors section
- Installation is now broken up (needs further work)