Make site behave like single page application

[PhilippSalvisberg]

You can navigate to the next and previous page by pressing the keys n and p. However, this leads to a reload of the page and the site feels sluggish. The user can see how the version selector drop down list is included into the page after the page load.

Materials for Mkdocs supports

• versioning
• instant page loading

These features should be enabled to improve the end user experience.

The custom JavaScript that produces the version drop down list is not required anymore.

The new drop down list will be shown on the title bar, after the title and the version number. This is redundant. Therefore I suggest to do not display the version number in the title anymore. The version selector is good enough in most cases. In cases such as "main" the version number is not visible. But that should be acceptable. This does not have an impact on the version number displayed in the PDF. It's still available there.