Update src/Cmf/MainBundle/Resources/data/page.yml
Update src/Cmf/MainBundle/Resources/data/page.yml

Fix install instructions due to change in composer default stability level
PhilippHToner/symfony-cmf-website,ElectricMaxxx/symfony-cmf-website,joemoe/symfony-cmf-website,PhilippHToner/symfony-cmf-website,joemoe/symfony-cmf-website