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Update masthead.html (#2332)

* Update masthead.html

fix image path in masthead for relative url

* Update _includes/masthead.html

Co-Authored-By: iBug ♦ <git@ibugone.com>

Fix schema.org dates to ISO-8601 (#2339)

* Fix schema.org dates to ISO-8601

* Revert date_to_xmlschema in <time> tag

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Set background-color = inherit for <pre code> in notices (#2328)

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Make feature row live well with TOC, fix #2327 (#2329)

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Fixed page.excerpt to seo_description (#2326)

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Add missing dutch ui-text fields (#2321)

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Add social icon color for Keybase (#2302)

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Support page header (page hero) in archive-taxonomy layouts (#2320)

* Support page header in archive-taxonomy layout

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Fix typo in _config.yml (#2319)

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Fix #2310

Release 4.17.2 💎 (#2296)

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