Add social page with archived mastodon posts, move source to /site

site/posts/posts.11tydata.cjs

@@ -0,0 +1,12 @@
+let data = {
+	layout: "_includes/post.njk",
+	eleventyComputed: {
+		lastModified: function(data) {
+			const fs = require('fs');
+			const stats = fs.statSync(data.page.inputPath);
+			return stats.mtime;
+		}
+	}
+};
+
+module.exports = data;