Refonte de la page “À propos” : vraie description, Gandi & Café des Sciences, mises à jour, vraie mise en page #1891

Job	Run time
Build Sphinx documentation	1m 1s
Lint	33s
Lint and build front-end	47s
Install and test zds-site (zds.tutorialv2)	7m 43s
Install and test zds-site (zds.member zds.gallery zds.searchv2 zds.middlewares zds.pages)	5m 48s
Install and test zds-site (zds.forum zds.featured zds.mp zds.notification zds.utils)	5m 56s
Push coverage to Coveralls	10s
Push documentation to GitHub Pages	0s
	21m 58s

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