Unifie les tutoriels et les articles sur les pages de la bibliothèque #2994

Job	Run time
Lint	24s
Lint and build front-end	44s
Build Sphinx documentation	1m 9s
Install and test zds-site (zds.tutorialv2)	5m 26s
Install and test zds-site (zds.forum zds.featured zds.mp zds.notification zds.utils)	4m 18s
Install and test zds-site (zds.member zds.gallery zds.search zds.middlewares zds.pages)	3m 38s
Push coverage to Coveralls	13s
Push documentation to GitHub Pages	0s
	15m 52s

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