Add documentation for Dependabot automation setup

[Copilot]

Provides step-by-step instructions for configuring Dependabot with auto-approve and auto-merge workflows in wptrainingteam repositories.

Changes

• Created DEPENDABOT-SETUP.md with complete setup guide
  • Fork, clone, branch, commit, push, and PR workflow
  • Configuration examples for npm-only, composer-only, and combined dependency setups
  • Full YAML configurations from existing .github/dependabot.yml and workflow files
  • Customization options (schedule intervals, assignees, multiple directories)
  • Troubleshooting section for common issues

Configuration Examples

NPM dependencies in subdirectories:

version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/subdirectory-1"
    schedule:
      interval: "weekly"
    assignees:
      - "YOUR_GITHUB_USERNAME"

Combined npm and composer:

version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
  - package-ecosystem: "composer"
    directory: "/"
    schedule:
      interval: "weekly"

Documentation references existing workflow files for auto-approve and auto-merge configurations.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create documentation on dependabot, auto-approve and auto-merge workflows</issue_title>
<issue_description>This plugin has a dependabot file, as well as an auto-approve and auto-merge workflow file.

Create detailed user instructions on how to create and configure these three files for other repositories in this organisation, by forking the repository to their own GitHub account, cloning the fork locally, creating a new branch, adding the required files, pushing the branch, and creating a new PR.

It should contain information for how to set up the dependabot file for repositories that have composer dependancies, npm dependancies, or a combination of both.

As far as possible, use only the configurations in the relevant files for this repository to create the examples in the documenation.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create documentation on dependabot, auto-approve and auto-merge workflows #14

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