Add Xquik to marketing data tools

[kriptoburak]

Summary

• Add Xquik to the marketing data science web-scraping list.
• Fix the malformed Singer destination in the Cloud ETL list.
• Preserve the file's existing CRLF convention and unrelated wording.

Independent Fix

The Singer entry nested one Markdown link inside another link destination.
That syntax does not produce a usable resource link. It now points directly
to Singer's active GitHub organization.

Validation

• Both changed destinations return HTTP 200.
• CRLF, Markdown-target, and duplicate-entry checks pass.
• git -c core.whitespace=cr-at-eol diff --check
• The final diff contains exactly 2 intended additions and 1 deletion.

The repository reports no GitHub check suite for this pull request.