Add sponsors

[marcoow]

We're signing up the first sponsors that need to be added to the website. We'll need one pull request each for:

• redpencil at partner level – can reuse image and URL from previous years
• Qonto at partner level – can reuse image and URL from previous years
• Mainmatter as dinner sponsor – can reuse image and URL from previous years

Resources

• Designs: https://www.sketch.com/s/150ed20a-d7c3-46a1-8151-89fba683acae/a/MmlKpPl

[marcoow]

@oscard0m will you be able to do this next week, assuming design is ready monday?

[oscard0m]

@oscard0m will you be able to do this next week, assuming design is ready monday?

Yes