Make Grad/Undergrad Course Filtering a Text Search

[sebthedev]

As requested by @melyshu.

[sebthedev]

Now implemented on dev. We'll need some tweaks on the frontend to complete implementation. Reassigning to @melyshu.

[melyshu]

It seems to me that all grad courses are 500 level courses and all 500 level courses are grad courses so the course level filter does the same job as this? Wondering if you could verify this in the database

[sebthedev]

I've done some exploring of the database:

// Find the number of courses with catalog number >= 500
db.getCollection('courses').find({catalogNumber: {$gte:'500'}}).count()
// returns 3035

// Find the number of grad courses
db.getCollection('courses').find({track: 'GRAD'}).count()
// returns 2910

// Fund the number of undergrad courses with catalog number >= 500
db.getCollection('courses').find({catalogNumber: {$gte: '500'}, track: 'UGRD'}).count()
// returns 125

Many of the 125 undergrad courses with catalog number >= 500 are the mysterious courses with catalog numbers in the 90s (see issue #8). Otherwise some of these courses are junior independent work courses (which some department use 9xx for)