Add refetch button to assignment list #200

Job	Run time
Make SDist	1m 48s
test_nbgrader (windows-latest, python, 3.8)	13m 55s
test_nbgrader (windows-latest, python, 3.9)	15m 5s
test_nbgrader (windows-latest, python, 3.10)	13m 20s
test_nbgrader (windows-latest, python, 3.11)	12m 42s
test_nbgrader (ubuntu-22.04, docs, 3.11)	4m 15s
test_nbgrader (ubuntu-22.04, python, 3.8)	10m 57s
test_nbgrader (ubuntu-22.04, python, 3.9)	11m 1s
test_nbgrader (ubuntu-22.04, python, 3.10)	11m 20s
test_nbgrader (ubuntu-22.04, python, 3.11)	10m 22s
Install from SDist and Test	3m 26s
	1h 48m 11s

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