Remove unused popularity data file

[dhruvkb]

Description

This PR removes the redundant pop_col.csv file. It is not used anywhere.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[obulat]

Love the branch name! :)

[krysal]

+1 for the branch name 😆