updates client starter code [Ready to merge]

[jpvajda]

• This PR is an attempt to update this project to React 18 standards.
• it also removes the yarn.lock file, as this seems to be focused on NPM not Yarn
• Finally this is still WIP so please don't merge in just yet. 😉

Related PRs

#298
https://github.com/apollographql/odyssey/pull/544

[jpvajda]

@rkoron007 This work is done now! Just a note all the changed made here would also be needed to be made in the final code. is that something you could do ?

[rkoron007]

I went through and made a corresponding PR for updating the final code, I ran into some improvement on the way but please let me know if anything doesn't look good to you!

[jpvajda]

@rkoron007 👋 I fixed all those suggestions and merged in your suggested commits.

[jpvajda]

@rkoron007 I fixed all those hidden comments, let me know if there is anything else. Thank you!

[rkoron007]

Approved after the top-level package-lock.json file is removed :)

[jpvajda]

@rkoron007 I removed the file! So this is ready to merge now?

[rkoron007]

@jpvajda - we'll need to merge https://github.com/apollographql/odyssey/pull/544 and this one at the same time to ensure that the instructions match the starter code. So soon! But not quite yet.