show grades for readings on student page once grades are released

[presnick]

In assignments/doAssignment:

Handle readings assignments analogous to questions:

• create a query readings_scores to get the student's scores on the readings (maybe have it also record the actual number of activities completed when grading?)
• fix readings query to also get the points and the number of activities required (and the number of potential activities would be nice, but not currently stored in the DB)
• use the chapter and subchapter fields to generate the link to the url; showing the number of required activities, number of points possible, and student's points.
• get rid of all the existing stuff for showing whether the student started reading the chapter.

[presnick]

This is done, but would be much better if the autograder for readings recorded the number of activities completed, as that would be useful feedback to students.

[github-actions[bot]]

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