Updated Set a BentoBox world as the server default world (markdown)

Set-a-BentoBox-world-as-the-server-default-world.md

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-WIP
+## Introduction
+
+**Setting a BentoBox world as the server default world** allows to avoid the generation of the **default vanilla worlds**.
+
+In this step-by-step example/tutorial, we're considering you're doing this for `BSkyBlock`, yet **the process remains identical for all available gamemodes**.
+
+## Preparations
+
+1. The whole procedure needs to be executed while the server is **switched off**.
+2. Delete the vanilla worlds (`world`, `world_nether`, `world_the_end`) by deleting their folders.
+
+![worlds to delete](https://user-images.githubusercontent.com/20014332/62977233-bebf1180-be1e-11e9-9ec8-ddcfd3352b13.png)
+
+*Highlighted folders are those of the default worlds. They must be deleted.*
+
+## server.properties
+
+Open the `server.properties` file.
+
+Find the following line:
+```properties
+level-name=world
+```
+
+Replace `world` with the name of the BentoBox world. It usually is `[gamemode]_world`, where `[gamemode]` is the lowercased gamemode's name (e.g. `bskyblock` or `caveblock`). However, it can be modified in the gamemode's `config.yml` file, so make sure it is the correct one.
+
+For the sake of simplicity, we will expect the world name to remain untouched and generic, and therefore being `bskyblock_world`.
+
+The line should now look like this:
+```properties
+level-name=bskyblock_world
+```
+
+## bukkit.yml
+
+Open the `bukkit.yml` file: we need to tell Bukkit that the world we're willing to make the default one uses a custom generator, **otherwise it will mess up the world generation**.
+
+The configuration section we're willing to edit being optional, it is extremely likely that it does not exist already in your `bukkit.yml` file. See the official [Bukkit Wiki](https://bukkit.gamepedia.com/Bukkit.yml#.2AOPTIONAL.2A_worlds) for more details about the section.
+
+Add the following section to your file (do appropriate revisions if you're not using the Nether or the End at all):
+```yaml
+worlds:
+  bskyblock_world:
+    generator: BentoBox
+  bskyblock_world_nether:
+    generator: BentoBox
+  bskyblock_world_the_end:
+    generator: BentoBox
+```