Use a script published to repackage the Gemini .deb packages into .rpm
packages.

Now checked on Fedora 39.
Also add instructions for Ubuntu (checked on Ubuntu 22.04)

- change the getting-started page to add the list of packages to
  install in order to compile the 'miminal' setup.

- add a 'build-additional-dependencies' page, with the instructions to
  build a 'whole version' of Monado.
  Note that Tracy is used for real-time tracing, in order to be
  compatible with a win32 installation.

It has been checked on a fresh Fedora 38 Desktop.