Add refactoring tips

[marina-workco]

No description provided.

[marina-workco]

Lets try to make this part of code DRY

 useEffect(() => {
    fetch("http://localhost:3333/664/api/candidates")
      .then(res => res.json())
      .then(res => setCandidates(res))
      fetch("http://localhost:3333/664/api/companies")
      .then(res => res.json())
      .then(res => setCompanies(res))
      fetch("http://localhost:3333/664/api/reports")
      .then(res => res.json())
      .then(res => setReports(res))
      fetch("http://localhost:3333/444/api/users")
      .then(res => res.json())
      .then(res => setUsers(res))
  }, [])