[Refactor] 1052 Merge CSS into JS for header block

[rgravitvl]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--danaher-ls-aem--hlxsites.hlx.page/
• After: https://1052-merge-css-into-js-header--danaher-ls-aem--hlxsites.hlx.page/

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Commits

* [86f7921](https://github.com/hlxsites/danaher-ls-aem/commit/86f792172018f0fd6ee4a52a8a41a3bd29a1d819) :white_check_mark: (latest) * [69d018c](https://github.com/hlxsites/danaher-ls-aem/commit/69d018c15202966e1adc3a2fcfd0d31afe28d4fa) :white_check_mark: * [f40a49f](https://github.com/hlxsites/danaher-ls-aem/commit/f40a49fcf1de69b3680ee4c2b3d207041dcbb111) :white_check_mark: * [dc02d05](https://github.com/hlxsites/danaher-ls-aem/commit/dc02d05bdfd05ae2210860eede87189177ff0bb2) :white_check_mark: * [ddf49ec](https://github.com/hlxsites/danaher-ls-aem/commit/ddf49ec8701e80d85caa082ae7dd43028327a0e3) :white_check_mark:

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