Add workflow to auto-create PRs from docs in `baird-beer-quadrants` repository

[josh-wong]

Description

This PR adds a workflow that auto-create PRs when docs from my baird-beer-quadrants repository have been updated.

Related issues and/or PRs

Created a similar PR in #25.

Changes made

• Created a workflow to sync updated docs from the baird-beer-quadrants source repository to this repository.

Checklist

The following is a best-effort checklist. If any items in this checklist aren't applicable to this PR, add N/A after each item.

Documentation

• [x] I have updated the side navigation as necessary. `N/A
• [x] I have updated the documentation to reflect the changes. `N/A
• [x] I have documented or updated any remaining open issues linked to this PR in GitHub, Obsidian, etc. `N/A

Build, deploy, and test

• [x] I have merged and published any dependent changes in other PRs. `N/A
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have checked that my changes look as expected on a locally built version of the docs site. `N/A
• [x] My changes generate no new warnings.

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