Update 03-5-ways-to-host-postgresql.mdx

[huseyinbabal]

• ElephantSQL already announced end of life
• Rapidapp, PostgreSQL as a service

[vercel]

@huseyinbabal is attempting to deploy a commit to the Prisma Team on Vercel.

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[meletj]

Thanks @huseyinbabal, I'll remove ElephantSQL from the list. Doing so in a separate PR along with other changes. Thanks again for flagging this up.

[huseyinbabal]

@meletj thanks for the action :) Will you add Rapidapp in separate PR?

[meletj]

For now, I will stick to the original options we listed.