JuMP-dev 2024: add JuliaHub sponsorship (#130)

Author: odow

_posts/2023-10-22-jump_dev_2024.md

@@ -106,3 +106,5 @@ To contact the program committee, write to `[email protected]`.
 
 <a href="https://www.gerad.ca/en" style="background-image:none;"><img style="height:90px;margin:45px" src="/assets/jump-dev-workshops/2024/Gerad_Logo_CMYK_ang_Med_Res.jpg" alt="GERAD logo"></a>
 <a href="https://opensource.google" style="background-image:none;"><img style="height:90px;margin:45px" src="/assets/jump-dev-workshops/2024/logo_Google_FullColor_hdpi_830x271px.png" alt="Google logo"></a>
+
+<a href="https://juliahub.com" style="background-image:none;"><img style="height:90px;margin:45px" src="/assets/jump-dev-workshops/2024/JuliaHub.png" alt="JuliaHub logo"></a>