Feat billable hours

[Summer-luna]

Description

• update report by employee table ui
• update report by project table ui
• put report by employee table and report by project table in one page
• able to edit each employee's project billable hours

Checklist

• This PR can be reviewed in under 30 minutes
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have assigned reviewers to this PR.