Add support for administration apis + redo frontend

[tombiddulph]

This pull request makes significant changes to the project's GitHub Actions workflows and removes several Blazor component files. The main improvements are the introduction of new, more modular CI and release workflows, and the removal of legacy or unused Blazor UI components.

Workflow improvements:

• Added a new .github/workflows/ci.yml workflow for continuous integration, which builds, tests, and pushes Docker images on pushes and pull requests, with versioning handled by GitVersion.
• Added a new .github/workflows/release.yml workflow to automate building, testing, Docker image publishing, and GitHub release creation on tag pushes.
• Removed the old .github/workflows/build-push-container.yaml workflow, consolidating Docker build and push logic into the new workflows.

Blazor UI cleanup:

• Removed the following Blazor component files that are no longer needed or used:
  • Components/App.razor
  • Components/Layout/MainLayout.razor
  • Components/Layout/NavMenu.razor
  • Components/Pages/Error.razor
  • Components/Pages/Home.razor