Move components into dedicated subdirectory

This brings us a lot more tidiness.

components/load_avg.c

@@ -0,0 +1,18 @@
+/* See LICENSE file for copyright and license details. */
+#include <err.h>
+#include <stdlib.h>
+
+#include "../util.h"
+
+const char *
+load_avg(const char *fmt)
+{
+	double avgs[3];
+
+	if (getloadavg(avgs, 3) < 0) {
+		warnx("Failed to get the load avg");
+		return NULL;
+	}
+
+	return bprintf(fmt, avgs[0], avgs[1], avgs[2]);
+}