Migrate puppet page to new puppet skaffolding pages

This splits the existing pages into multiple ones:

• (new) reference-setup.rst: This is the main page filled in with the existing one
• (update) howto-test-changes-in-vagrant.rst: reference link got updatee to the current readme section)
• (update) howto-manage-third-party-modules.rst: coming from the main page with links broken fixed
• (update) howto-deploy-puppet-change.rst: coming from main page with links broken fixed
• (update) tutorial-my-first-change-in-puppet.rst: With some actual updates on how to develop, diffing and asking for review.

Related to T3154