feat: added slugs and sorted blog posts by year

...19/2019-01-22-la-france-a-t-elle-perdu-sa-souverainete.md

blog/2019/2019-01-25-gitlab-versus-github.md

blog/2019/2019-01-29-gitlab-11-7-est-sorti.md

...2019-02-01-le-shutdown-une-menace-sur-la-cybersecurite.md

...019-02-05-scaleway-agree-hebergeur-de-donnees-de-sante.md

blog/2019/2019-02-08-the-copenhagen-letter.md

...19/2019-02-12-comment-gagner-de-largent-avec-le-devops.md

.../2019-02-19-devops-cest-bien-beau-mais-on-y-gagne-quoi.md

blog/2019/2019-02-19-histoire-devops.md

blog/2019/2019-02-26-gitlab-11-8-petite-exploration.md

blog/2019/2019-03-01-pourquoi-les-compagnons-du-devops.md

blog/2019/2019-03-05-sois-agile-et-tais-toi.md

...-devriez-vous-pas-aller-chez-aws-azure-ou-google-cloud.md

...9/2019-07-03-comment-ne-pas-se-tromper-grace-au-devops.md

...2019/2019-07-24-gitlab-12-lapplication-devops-integree.md

...020/2020-01-15-rdo-1-ingenieur-devops-mythe-ou-realite.md

blog/2020/2020-02-07-es-1-dou-vien-le-cloud-act.md

...du-chatops-avec-mattermost-pour-accelerer-leur-travail.md

...0-02-21-rdo-2-reconquerir-notre-souverainete-numerique.md

...02-28-es-2-ton-code-source-est-il-vraiment-en-securite.md