Rugged: Update continuous integration link and add links to source code quality and coverage

CI was updated for Rugged (like in Orekit):

• under Community tab:

  • change link from Jenkins to Gitlab CI pipelines: https://gitlab.orekit.org/orekit/rugged/pipelines
  • add link to Source code quality: https://sonar.orekit.org/dashboard?id=org.orekit%3Arugged

• in the home page, add badges to :

  • quality date (source code quality): https://sonar.orekit.org/dashboard?id=org.orekit%3Arugged
  • coverage: https://sonar.orekit.org/component_measures?id=org.orekit%3Arugged&metric=coverage&view=treemap