Revert "Rename directories"

This reverts commit 9f3226aec5.

taking-flight-with-tailwind-css/sections/plugins.rst

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+.. page:: titlePage
+
+.. class:: centredtitle
+
+Extending Tailwind CSS with Plugins
+
+.. page::
+
+.. class:: centredtitle
+
+``npm install --save-dev
+tailwindcss-list-reset``
+
+.. page:: standardPage
+
+Adding a plugin
+===============
+
+.. code-block:: javascript
+    :include: code/plugins-add-plugin.txt
+
+Generated CSS
+=============
+
+.. code-block:: css
+    :include: code/plugins-generated-css.txt
+
+Writing a plugin
+================
+
+.. code-block:: javascript 
+    :include: code/plugins-plugin-source.txt