Updated the main bundles article for Symfony 4#8613

Closed

javiereguiluz wants to merge 3 commits intosymfony:masterfrom

javiereguiluz:update_bundles

Commits on Nov 10, 2017

Updated the main bundles article for Smyfony 4
javiereguiluz
committed
Made the bundles index page an orphan page to supress RST warnings
javiereguiluz
committed

Commits on Nov 12, 2017

Changes requested by reviews
javiereguiluz
committed