feat: integrate target using json offers

[vtsaplin]

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 #450

Test URLs:

• Before: https://main--bitdefender--hlxsites.hlx.live/solutions/
• After: https://target-json--bitdefender--hlxsites.hlx.live/solutions/

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[aem-code-sync]

Page	Scores	Audits	Google
/solutions/

[ramboz]

Overall logic looks good. I left various comments for minor things.