Use JavaScript to add counts to annotations

[mgaudet]

I'd love it if the annotation section

Annotations:

📤: Remote Work Supported

🧑‍🎓: Internships offered

🗺 : Location

Included counts of how many companies hit the annotations; something like this

Annotations:

📤 (25): Remote Work Supported

🧑‍🎓 (12): Internships offered

🗺 (13 known): Location

Most should be straightforward to implement, though Location might require some special handling as companies often have many locations.

We already dynamically compute the count of companies