Unify licenses

[bb]

I noticed the following files specify ISC while the rest of the project is MIT. Maybe those should be changed to MIT (or the lines removed, as there's also no extra license in the playground's package.json).

• https://github.com/meilisearch/instant-meilisearch/blob/master/examples/esm/package.json#L11
• https://github.com/meilisearch/instant-meilisearch/blob/master/examples/express/package.json#L11

I'm happy to provide a PR if you tell me which way you prefer.

[curquiza]

Hello @bb!
Indeed, you're right, MIT would be better! We would be really glad to review your PR 😁