Updated HTML docs.

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

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-# Part 4: Using what we created
-
-```{sidebar} Beginner Tutorial Parts
-- [Introduction](../Beginner-Tutorial-Intro.md)
-<br>Getting set up.
-- Part 1: [What we have](../Part1/Beginner-Tutorial-Part1-Intro.md)
-<br>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.md)
-<br>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.md)
-<br>Getting down to the meat of extending Evennia to make our game
-- **Part 4: [Using what we created](./Beginner-Tutorial-Part4-Intro.md)**
-<br>Building a tech-demo and world content to go with our code
-- Part 5: [Showing the world](../Part5/Beginner-Tutorial-Part5-Intro.md)
-<br>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} 
-
-```