Add workflows that auto-create PRs

[josh-wong]

Description

Provide a brief description about why this PR is necessary. Be sure to provide context.

This PR adds workflows that auto-create PRs when docs-related PRs in certain GitHub repositories have been updated. This workflow should reduce the time I spend having to manually add docs and create PRs.

Related issues or PRs

• Based on workflows added in the following PRs:
  • https://github.com/josh-wong/bitcoin-cash-node-on-raspberry-pi/pull/10
  • https://github.com/josh-wong/passGen/pull/3
  • https://github.com/josh-wong/zune-software-setup/pull/17

Changes made

• Created workflows to sync updated docs from source repositories to this repository based on branch-naming patterns.

Checklist

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

Documentation

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

Build, deploy, and test

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