Consider adding Axios as dependency

[Alexnortung]

Hello, I am getting an error when trying to run strapi with this plugin in my docker container.

Could not load js config file /opt/node_modules/strapi-plugin-react-editorjs/strapi-server.js: Cannot find module 'axios'
...

If I add axios to my dependencies in my project it works.

But I find it confusing that axios is required in some files in this project, but not added as a dependency in package.json.