Refonte de la page “À propos” : vraie description, Gandi & Café des Sciences, mises à jour, vraie mise en page #1892

Job	Run time
Lint and build front-end	1m 4s
Build Sphinx documentation	1m 2s
Lint	34s
Install and test zds-site (zds.tutorialv2)	9m 34s
Install and test zds-site (zds.member zds.gallery zds.searchv2 zds.middlewares zds.pages)	6m 8s
Install and test zds-site (zds.forum zds.featured zds.mp zds.notification zds.utils)	6m 56s
Push coverage to Coveralls	13s
Push documentation to GitHub Pages	0s
	25m 31s

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