[#2176] Move from Vue CLI to Vite

[sopa301]

Fixes #2176

Proposed commit message

Move from Vue CLI to Vite

Vue CLI has been put on maintenance mode and its dependencies have
security issues that have not been fixed for a while. Switching to Vite
also allows us to introduce Vitest for our unit testing.

Let's install Vite and remove Vue CLI.

Other information

A few things worthy of discussion:

• The Vite migration guide suggests removing Babel (which supports older browsers), which has been done so. If we decide to retain support for them, we can do so with a plugin.
• The Vite changes remove the ability to configure the title and source folder for the html file from the config file. However, now that the html file has been moved out of the public folder (by design of Vite), this may not be a big concern. We can use a .env file if we want to be able to edit the title and root folder from another file.
• The Cypress tests on CI did not work initially and had to be hotfixed by adding "chromeWebSecurity": false into the Cypress config file. Since this is not very extensible to other browsers, we should also find another way to get the tests to work.