Revert "Rename directories"

This reverts commit 9f3226aec5.

taking-flight-with-tailwind-css/code/1-adding-tailwind-directives.txt

@@ -0,0 +1,7 @@
+/* src/css/tailwind.pcss */
+
+@tailwind base;
+
+@tailwind components;
+
+@tailwind utilities;