Convert master docs to use MyST

docs/source/Adding-Command-Tutorial.md

@@ -1,6 +1,6 @@
 # Adding Command Tutorial
 
-This is a quick first-time tutorial expanding on the [Commands](./Commands) documentation.
+This is a quick first-time tutorial expanding on the [Commands](./Commands.md) documentation.
 
 Let's assume you have just downloaded Evennia, installed it and created your game folder (let's call
 it just `mygame` here). Now you want to try to add a new command. This is the fastest way to do it.
@@ -16,7 +16,7 @@ example code.
 1. Give your class a useful _docstring_. A docstring is the string at the very top of a class or
 function/method. The docstring at the top of the command class is read by Evennia to become the help
 entry for the Command (see
-   [Command Auto-help](./Help-System#command-auto-help-system)).
+   [Command Auto-help](./Help-System.md#command-auto-help-system)).
 1. Define a class method `func(self)` that echoes your input back to you.
 
 Below is an example how this all could look for the echo command:
@@ -47,7 +47,7 @@ Below is an example how this all could look for the echo command:
 
 ## Step 2: Adding the Command to a default Cmdset
 
-The command is not available to use until it is part of a [Command Set](./Command-Sets). In this
+The command is not available to use until it is part of a [Command Set](./Command-Sets.md). In this
 example we will go the easiest route and add it to the default Character commandset that already
 exists.
 
@@ -87,13 +87,13 @@ your command definition).
 by
 its argument `test` (which will end up in `self.args). To change this behavior, you can add the
 `arg_regex` property alongside `key`, `help_category` etc. [See the arg_regex
-documentation](Commands#on-arg_regex) for more info.
+documentation](./Commands.md#on-arg_regex) for more info.
 
 If you want to overload existing default commands (such as `look` or `get`), just add your new
 command with the same key as the old one - it will then replace it. Just remember that you must use
 `@reload` to see any changes.
 
-See [Commands](./Commands) for many more details and possibilities when defining Commands and using
+See [Commands](./Commands.md) for many more details and possibilities when defining Commands and using
 Cmdsets in various ways.
 
 
@@ -102,7 +102,7 @@ Cmdsets in various ways.
 Adding your Command to the `CharacterCmdSet` is just one easy exapmple. The cmdset system is very
 generic. You can create your own cmdsets (let's say in a module `mycmdsets.py`) and add them to
 objects as you please (how to control their merging is described in detail in the [Command Set
-documentation](Command-Sets)).
+documentation](./Command-Sets.md)).
 
 ```python
     # file mygame/commands/mycmdsets.py
@@ -131,7 +131,7 @@ only make the new merged cmdset permanent on that *single* object. Often you wan
 this particular class to have this cmdset.
 
 To make sure all new created objects get your new merged set, put the `cmdset.add` call in your
-custom [Typeclasses](./Typeclasses)' `at_object_creation` method:
+custom [Typeclasses](./Typeclasses.md)' `at_object_creation` method:
 
 ```python
     # e.g. in mygame/typeclasses/objects.py