Update faculty / department emails for Course Details error reporting

[kokrui]

We have a "Report Errors" button on each Course Detail page. (See #3784)

However, some faculty emails listed there should be deprecated (e.g., GEQ1000, a course that no longer exists), and there are new emails which should be added.

We should incrementally improve this! If you notice data that should be added / removed / updated, please make a PR or issue to update https://github.com/nusmodifications/nusmods/blob/master/website/src/data/facultyEmail.json

[dasha3412]

Hi, I'd like to work on this