Replaces Azure DevOps CI pipeline with one based on GitHub Actions.
- GitHub Actions workflow: Although Azure Pipelines has served us well throughout the years, the time has come to replace it with GitHub Actions. Now, the whole build/release pipeline is implemented as a GitHub Actions workflow.
- Set-TfsTeamProject: This new cmdlet adds support to editing team project details. It is a work in progress, though; presently, it only supports setting the team project icon ("avatar").
- Fix documentation site generation (cd8bc36)