Fix browser back trough latest version

[tbuerli-komax]

Bug: Browser back navigation doesn't work when navigating back through the "latest" version.

How to reproduce:

1. For a new project, upload a documentation with a specific version, for example, v1.0.0
2. Open the project by clicking on it. (browser URL should end in "/latest/")
3. Navigate to a subpage of the documentation by clicking on a link. (browser URL should contain "/v1.0.0/")
4. Through browser navigation, navigate back to the previous page. (browser URL should end in "/latest/")
5. Results in "404 - Not Found", but should again display the root of the latest documentation, as it did in step 2.
6. Additionally, the "Back to Project Home" on the error page doesn't work.

Changes done:

• The first commit fixes the above-mentioned bug by splitting Version and DisplayVersion into different states.
• While looking at the state handling and the requests done by the browser, it looked a bit off, and when looking closer, it turns out that navigations to the upload page did completely re-fetch the page from the server; this prevents the context managers from keeping the context. To fix this, the links were adapted to use the React Link Component. Further, a refresh logic was introduced to keep the versions displayed up to date. The refresh interval can be configured and is set to 30 seconds by default.

I hope this matches the coding style of the repository. It was a bit unclear to me where the documentation for the reloadIntervalSeconds should go. Is this better in the main README.md as an example parameter or in the web/README.md as an additional section?

[fliiiix]

Hoi 👋 thanks for your contribution can you please break this down into smaller merge requests? In the current state this is very hard to review.

It was a bit unclear to me where the documentation for the reloadIntervalSeconds should go.

I don't think this is a feature we want to support so you can drop it completely, which should resolve the need to document it :)