Prefixing image location with hostname when it doesnt exist

[sunidhiazad]

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 #121

Test URLs:

• Before: https://main--servicenow--hlxsites.hlx.live/tools/sidekick/library.html?plugin=blocks
• After: https://121-library--servicenow--hlxsites.hlx.live/tools/sidekick/library.html?plugin=blocks

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/tools/sidekick/library.html?plugin=blocks