add generate instructor assignment data prompt

prompts/generate_instructor_assignment_data.md

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+Modify GenerateSectionData in the following ways:
+
+1. it should take a second argument which is a list of Users
+1. replace the section where Instructors are generated according to config.NumberOfInstructors with a section that makes a list of users with Status "Instructor" from the Users argument
+
+Remove NumberOfInstructors from the Config type and correct all instances of it in the code
+
+Write a function GenerateInstructorAssignmentData that takes a list of Users and a list of Sections and returns an []InstructorsSections.  This should pair instructors with sections, trying its best to distribute Sections evenly between instructors
+
+Write a function SaveInstructorsSections that simply writes this list to a file called "instructors_sections.csv".