[Docs site] Add last updated metadata

Author: kodster28

src/components/overrides/Head.astro

@@ -12,6 +12,7 @@ const NOINDEX_PRODUCTS = ["email-security", "style-guide", "security"];
 const currentSection = Astro.url.pathname.split("/")[1].replaceAll(".", "");
 
 const entry = Astro.locals.starlightRoute.entry;
+const lastUpdated = Astro.locals.starlightRoute.lastUpdated
 const frontmatter = entry.data;
 const head = frontmatter.head;
 
@@ -64,6 +65,18 @@ if (currentSection) {
 			});
 		}
 
+		if (lastUpdated) {
+			const daysBetweenUpdate = differenceInCalendarDays(new Date(), lastUpdated);
+			head.push({
+				tag: "meta",
+				attrs: {
+					name: "pcx_last_modified",
+					content: daysBetweenUpdate.toString(),
+				},
+				content: "",
+			});
+		}
+
 		if (product.data.product.group) {
 			head.push({
 				tag: "meta",