Use migrated Minecraft wiki link now

Minecraft wiki has already migrated from annoying Fandom for some time.
This commit is made to follow their initiatives about stopping the use of old Minecraft wiki link.

README.md

@@ -250,7 +250,7 @@ by the LWJGL-provided natives).
 #### Miscellaneous
 With `--dry`, the start command does not start the game, but simply installs it.
 
-With `--demo` you can enable the [demo mode](https://minecraft.gamepedia.com/Demo_mode) 
+With `--demo` you can enable the [demo mode](https://minecraft.wiki/w/Demo_mode) 
 of the game.  
 
 With `--resolution <width>x<height>` you can change the resolution of the game window.

portablemc/standard.py

@@ -49,7 +49,7 @@ def __init__(self,
 
         :param main_dir: The main directory where versions, assets, libraries and 
         optionally JVM are installed. If not specified this path will be set the usual 
-        `.minecraft` (see https://minecraft.fandom.com/fr/wiki/.minecraft).
+        `.minecraft` (see https://minecraft.wiki/w/.minecraft).
         :param work_dir: The working directory from where the game is run, the game stores
         thing like saves, resource packs, options and mods if relevant. This defaults to
         `main_dir` if not specified.