docs: add JacobCoffee as a contributor for doc, infra, and 2 more

[allcontributors[bot]]

Adds @JacobCoffee as a contributor for doc, infra, design, ideas.

This was requested by JacobCoffee in this comment

[skip ci]

[railway-app[bot]]

This PR was not deployed automatically as @allcontributors[bot] does not have access to the Railway project.

In order to get automatic PR deploys, please add @allcontributors[bot] to the project inside the project settings page.

[allcontributors[bot]]

@railway-app[bot]

@allcontributors[bot] already contributed before to projectManagement