docs(logo): Add WePublish logo to discover/who-uses

[harm-less]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/docs.nestjs.com/blob/master/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

• Docs

What is the new behavior?

Added WePublish logo

We currently use NestJS in production since a year. We're really happy to have chosen this great project as the foundation of our back-end. Our API is mainly powered by GraphQL but we also have a bit of REST.
Great work!

P.s.: It would be nice to have the following PR merged merged as well as it prevents us from moving to NestJs 9.x 😇
nestjs/graphql#2559

Does this PR introduce a breaking change?

• Yes
• No

[kamilmysliwiec]

For now, we decided to suspend adding more logos as there's a decent number of logos present there already and the page itself is getting bloated with images (we may even remove some of them in the near future). Instead, please consider adding yourself to the list below!