Refactor 1.0 docs with new toctree structure and inheritance

docs/source/Howtos/Beginner-Tutorial/Part4/Beginner-Tutorial-Part4-Intro.md

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+# Part 4: Using what we created
+
+```{eval-rst}
+..sidebar:: Beginner Tutorial Parts
+
+  `Introduction <../Beginner-Tutorial-Intro.html>`_
+    Getting set up.
+  Part 1: `What we have <../Part1/Beginner-Tutorial-Part1-Intro.html>`_
+    A tour of Evennia and how to use the tools, including an introduction to Python.
+  Part 2: `What we want <../Part2/Beginner-Tutorial-Part2-Intro.html>`_
+    Planning our tutorial game and what to think about when planning your own in the future.
+  Part 3: `How we get there <../Part3/Beginner-Tutorial-Part3-Intro.html>`_
+       Getting down to the meat of extending Evennia to make our game to make a tech-demo
+  **Part 4: Using what we created**
+    Using the tech-demo and world content to go with our code
+  Part 5: `Showing the world <../Part5/Beginner-Tutorial-Part5-Intro.html>`_
+    Taking our new game online and let players try it out
+```
+
+We now have the code underpinnings of everything we need. We have also tested the various components
+and has a simple tech-demo to show it all works together. But there is no real coherence to it at this
+point - we need to actually make a world.
+In part four we will expand our tech demo into a more full-fledged (if small) game by use of batchcommand
+and batchcode processors.
+
+## Lessons
+
+_TODO_
+
+```{toctree} 
+:maxdepth: 1
+
+```
+
+
+## Table of Contents
+
+_TODO_
+
+```{toctree} 
+
+```