[OTHER] Adapt the gitpod environment to work with nextjs

[thamerla]

What would you like to share?

Current gitpod environment is tailored to work with the react version, but not the nextjs version - i.e. it lacks mongodb. Also, there's no warning about that in the README,

Additional information

Related to #1606 (issues around creating your own dev environment) and #1601 (improving the docs)

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[eddiejaoude]

Thank you! I think this has now been solved