Update README to document gh aw add / gh aw update workflow installation

[Copilot]

The README described these agentic workflows as reusable via GitHub Actions uses:, which is not how they are consumed. This updates the docs to show the supported install and update path with gh aw.

• Usage model

  • Replaces the uses:-based integration guidance with explicit gh aw add instructions
  • Clarifies that consumers should import the workflow source into their own repository, not reference this repo at runtime

• Supported entry points

  • Documents add commands for:
    • dependabot-review (installed from dependabot-repair.md with --name)
    • dependabot-campaign
    • dependabot-review-reusable (installed from dependabot-repair-reusable.md with --name)

• Ongoing maintenance

  • Adds gh aw update examples for each imported workflow
  • Notes that consumers should review and commit both the imported .md file and generated .lock.yml
  • Explains that the upstream source filenames in this repository still use dependabot-repair, while the consumer-facing installed workflow names use dependabot-review

• README cleanup

  • Removes the old reusable-workflow YAML examples and outdated path reference
  • Keeps the distinction between local review behavior and centralized campaign coordination

Example:

gh aw add githubnext/dependabot-campaign/.github/workflows/dependabot-repair.md --name dependabot-review
gh aw update dependabot-review

[mnkiefer]

@copilot Rename dependabot-repair to dependabot-review

[Copilot]

@copilot Rename dependabot-repair to dependabot-review

Updated in 1c53cf1 to use dependabot-review / dependabot-review-reusable as the consumer-facing workflow names in the README examples.