[web] Deleted unused file
Summary:
We don't use this file. We use color-selector instead.
Deleted it and related css.
Test Plan:
Tested if app runs.
Tested if color picking in thread works.
Reviewers: tomek, kamil, atul
Reviewed By: tomek
Subscribers: ashoat, atul, kamil, tomek
Differential Revision: https://phab.comm.dev/D5800