Notably fixes issue with building single container docker image

PSA: Update your NEXT_PUBLIC_API_HOSTNAME variable to use http://localhost:8000

What's Changed

• Clarify GCP docs by @tianjing-li in https://github.com/cohere-ai/cohere-toolkit/pull/141
• coral-web: modal to edit deployment env variables by @wujessica in https://github.com/cohere-ai/cohere-toolkit/pull/112
• backend: Make endpoints with IO operations async by default by @tianjing-li in https://github.com/cohere-ai/cohere-toolkit/pull/145

Full Changelog: https://github.com/cohere-ai/cohere-toolkit/compare/v1.0.3...v1.0.4