Checklist before deploying version 1.0.0

- [ ] Fix gh-actions authentication to deploy gh-pages by @ksatchit 
- [ ] Create a LitmusChaos maven account by @ksatchit 
- [x] Add error handling logics to the graphql wrapper functions by @jemlog 
- [ ] Check unused functions by @namkyu1999 
- [ ] Update a README.md by @jemlog @namkyu1999 


cc. @S-ayanide 