/assistants: add user count (#809)
* add user count
* Update formatUserCount.ts
* add 50-99 range
* Update src/lib/utils/formatUserCount.ts
Co-authored-by: Mishig <mishig.davaadorj@coloradocollege.edu>
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Co-authored-by: Mishig <mishig.davaadorj@coloradocollege.edu>
