417 search connector add tags

[netmanito]

Update helix-search search index to handle tags and categories

Fix #417

Test URLs:

• Before: https://main--vg-volvotrucks-us--hlxsites.hlx.page/
• After: https://417-search-connector-add-tags--vg-volvotrucks-us--hlxsites.hlx.page/

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