* Updated to current conventions
-Changed startup and testing to generic host.
-Changed exception handling from GlobalExceptionFilter to startup middleware.
-Changed DTO validation to IValidatableObject.
-Replaced TestStartup with generic host web application factory.
-Implemented current testing conventions, folder structure, integration tests, unit tests, etc.
-Implemented DTO validation tests.
-Created Constants class.
-General code cleanup.
* Docker file and client updates
-Created dockerfile to build client and service.
-Added @fluentui/react package to client.
* Completed upgrade to fluent and packages updates
-Completely updated App.tsx to fluent by replacing Customizer with a React.Fragment.
-Removed office-ui-fabric-core and office-ui-fabric-react packages which are now rolled into the @fluentui/react package.
-Updated to latest packages with npm update.
* Updated dependencies for deployment and dockerfile
-Moved package dependencies into devDependencies to optimize deployment.
-Fixed dockerfile comment.
Co-authored-by: Ben Werle <v-bewerl@microsoft.com>