EP2026 sponsor logos - Numberly & Back Market edit

src/content/sponsors/backmarket/index.md

@@ -6,11 +6,11 @@ industry: "Technology"
 description: Where the world shops refurbished tech.
 socials:
   linkedin: "https://www.linkedin.com/company/back-market/"
-  twitter: "https://twitter.com/EuroPython"
-  github:
+  github: "https://github.com/backmarket-oss"
   discord:
   mastodon: https://mastodon.social/@BackMarketEng
   bluesky: https://bsky.app/profile/backmarketeng.bsky.social
   instagram: https://www.instagram.com/backmarket
 tier: Gold
+logo_padding: 10px 10px
 ---

src/content/sponsors/numberly/index.md

@@ -0,0 +1,18 @@
+---
+name: Numberly
+url: https://numberly.tech/
+location: "France"
+industry: "Marketing Technologist"
+description:
+  "Numberly, a marketing technologist, invents and operates customer-centric
+  digital marketing at the crossroads of data, technology, and innovation. With
+  a global team of 500 experts, they help leading brands transform marketing
+  into long-term investment to boost performance, while supporting open source
+  and a culture of curiosity and innovation."
+socials:
+  linkedin: "https://www.linkedin.com/company/numberly/"
+  github: "https://github.com/numberly"
+  discord:
+  youtube: "https://youtube.com/@numberly"
+tier: Gold
+---