chore: unify header/footer decoration

[fkakatie]

unify decoration sequence for header and footer (same comments, same order)

fixes bug with header that previously left artifact of a stray empty div

Test URLs:

• Before: https://main--aem-boilerplate--adobe.hlx.live/
• After: https://unify-head-foot--aem-boilerplate--adobe.hlx.live/

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Commits

* [1449ba1](https://github.com/adobe/aem-boilerplate/commit/1449ba17ca2c33ef163b5ea3913ff7b28eb0cc05) :white_check_mark: (latest) * [4507539](https://github.com/adobe/aem-boilerplate/commit/4507539320bab1bc094ebdfc2d3defec6dd9fb95) :white_check_mark:

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