fix: ensure imported css declared as side effects

[tractorcow]

This resolves an issue when using import "plyr-react/plyr.css" where webpack would incorrectly detect that as an unused import and tree shake it away.

see gatsbyjs/gatsby#19446 for context

[sourcelevel-bot]

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[vizipi]

Pull request analysis by VIZIPI

Below you will find who is the most qualified team member to review your code.
This analysis includes his/her work on the code included in this Pull request, in addition to their experience in code affected by these changes ( partly found within the list of potential missing files below )   Feedback always welcome

Reviewers with knowledge related to these changes

Match %	Person	Commit Count	Common Files
100.00 %	Chintan Prajapati	152	2
100.00 %	amirHossein-Ebrahimi	42	2

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Potential missing files from this Pull request

files commonly committed with a subset of this pr, but not committed this time. (click to collapse)

File	Percentile	rate
package-lock.json	82.76 %	24 out of 29 times
rollup.config.js	41.38 %	12 out of 29 times

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Committed file ranks

(click to expand)

99.23%[README.md]

99.49%[package.json]

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication