Add OpenGraph images on old articles

content/en/post/self-hosting/index.md

@@ -1,6 +1,7 @@
 ---
 title: "Self-hosting: for a decentralized and responsible Internet"
 date: !!timestamp '2023-05-22 10:05:00'
+image: /post/self-hosting/og.webp
 tags:
 - privacy
 - hosting

content/fr/post/post-mortem-cryptominer-on-CI-infrastructure/index.md

@@ -1,6 +1,7 @@
 ---
 title: Post-mortem cryptominer on CI infrastructure
 date: !!timestamp '2022-03-06 19:32:00'
+image: /fr/post/post-mortem-cryptominer-on-ci-infrastructure/og.webp
 tags:
 - security
 - cryptominer

content/fr/post/self-hosting/index.md

@@ -1,6 +1,7 @@
 ---
 title: "L'auto-hébergement : pour un Internet décentralisé et responsable"
 date: !!timestamp '2023-05-22 10:05:00'
+image: /post/self-hosting/og.webp
 tags:
 - privacy
 - hosting