updating docusaurus to 3.0


A patch to axios is blocked on z3guide using an old version of docusaurus.
@pelikhan

The steps require updating package.json, associated links suggest updating several npm packages to 3.0.0
https://docusaurus.io/docs/migration#:~:text=Remove%20the%20node_modules%20folder%20and%20your%20package%20manager%27s,on%20the%20major.minor.patch%20scheme%20and%20respects%20Semantic%20Versioning.
