`OG:` Image and title for hackathons

[martineckardt]

Add custom OG data for hackathons so ok is like the following don't fall back to the default:

https://build.avax.network/hackathons/26bfce9b-4d44-4d40-8fbe-7903e76d48fa

Check the api folder and the academy that has custom images and titles for each page for reference

https://github.com/ava-labs/builders-hub/tree/master/app/api/og

https://www.opengraph.xyz/url/https%3A%2F%2Fbuild.avax.network%2Fhackathons%2Fa0e06824-4d70-4b60-98f7-4cf5d4c28b59

[Andyvargtz]

Image Preview on share

[sebaxor]

#3361