Review and Refactor breadcrumbs.html

[javabster]

The breadcrumb component needs a review and to be refactored to display headings that make more sense. E.g. the root title should not be "Docs" but should reflect the name of the specific repo the docs is rendering for. In addition there is a lot of legacy code in this file that could be cleaned up

[javabster]

Needs discussion: In the breadcrumb component there is a button for viewing the source code on github which currently doesn't really work (it just shows the .rst atm). It would be good to get this GitHub functionality working but my main question is what to do about old versions etc. Should the link always direct to the file in the main branch? Or should it direct to the version of the file corresponding to the version of the docs you are looking at? what about the latest version, should that direct to main or the latest stable version of the file?