Investigate usage of HashRouter for React Router

[tuliomir]

The purpose of this issue is to keep a yellow flag on our usage of the React Router v6.

Description

On #609 we moved our main router from the recommended BrowserRouter to the HashRouter to fix bugs with the built release version of the app.

At a first glance this will not cause any issues: the only side effect is that the application URLs will be less legible - but they are not read by the user nor the application itself directly: only through the router interface.

However, the official docs on the HashRouter explicitly do not recommend its usage. This is a yellow flag that should be considered whenever we make improvements or maintenances related to the router.

See PR 609 for more references and information on this issue.