Fix broken links in Developer's Toolkit maps

It was reported that there were some broken internal links in the documentation that were linking to urls based on the old structure. The only place I could find these were in the Developer's Toolkit layer maps where the links are hardcoded into the html. These would also not be picked up by the Sphinx linkcheck as they are outside of its scope.

I have been through these maps and updated the links to ensure there are no 404 errors. It is worth nothing that some of the tools displayed in these maps are old and possibly now obsolete so some time should be spent considering how to update these and which tools should be included. However, this MR is just focused on fixing the broken links.