chore: switch hero autoblock for fragment autoblocking

[davidnuescheler]

https://main--aem-boilerplate--adobe.hlx.page/drafts/uncled/index-fragment

vs.

https://auto-blocking-example--aem-boilerplate--adobe.hlx.page/drafts/uncled/index-fragment

this removes the hero auto blocking and adds fragment auto-blocking...

the changes in aem.js are only for illustration purposes and will be removed from the PR.

[aem-code-sync[bot]]

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/drafts/uncled/index-fragment

[trieloff]

This should go against aem-lib