Update README.md

Update README.md

Rename view_data.html to view_data.html

Rename taking_attendance.html to taking_attendance.html

Rename index.html to index.html

Rename absentees.html to templates/absentees.html

Rename add_student.html to templates/add_student.html

Rename dashboard.html to templates/dashboard.html

Rename remove_student.html to templates/remove_student.html

Rename shortage.html to templates/shortage.html

Rename taking_attendance.html to data/taking_attendance.html

Rename view_data.html to data/view_data.html

Rename index.html to data/index.html

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