Add DCAT-2 and DCAT-3 crosswalk pages (#66)

Author: bact

content/crosswalk/dcat-2.md

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+---
+title: "Crosswalk for DCAT 2 vocabulary"
+image: "/img/w3c.png"
+date: "2019-04-23"
+---
+
+Data Catalog Vocabulary (DCAT) is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the Web.
+
+[DCAT 2](https://www.w3.org/TR/vocab-dcat-2/) is superseded by DCAT 3,
+but DCAT 3 does not make DCAT 2 obsolete.
+DCAT 3 terms preserve backward compatibility with DCAT 2.
+
+{{< crosswalk name="DCAT-2" >}}
+
+See crosswalk for [DCAT 3](dcat-3).

content/crosswalk/dcat-3.md

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+---
+title: "Crosswalk for DCAT 3 vocabulary"
+image: "/img/w3c.png"
+date: "2025-04-24"
+---
+
+Data Catalog Vocabulary (DCAT) is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the Web.
+
+[DCAT 3](https://www.w3.org/TR/vocab-dcat-3/) is a W3C Recommendation.
+DCAT 3 supersedes DCAT 2, but DCAT 3 does not make DCAT 2 obsolete.
+DCAT 3 terms preserve backward compatibility with DCAT 2.
+
+{{< crosswalk name="DCAT-3" >}}
+
+See crosswalk for [DCAT 2](dcat-2).