In this project Vue is downloaded and included via a script tag and is registered as a global variable. Because of that there is no "build step" involved and it can't be used Single-File Component (SFC) syntax. You may have noticed that the imported component's template is inlined as a JavaScript string. Strings are prefixed with the /html/ comment to get syntax highlighting for them if you are using VSCode with es6-string-html extension.
git clone https://github.com/Bernard-Jelinic/cinestar.git
cd cinestar
Right-click on index.html file, and choose Open with from the menu. You will see a full list of apps that you can use to run your file. Your default browser will be at the top of the list. Select one browser from the list, and view your file in the browser.
The Cinestar app is open-sourced software licensed under the MIT license.