Fix: broken link in advance guides (OnionUI#1489)

Updated Big Zoom link to my server hosting the file here:
https://files.phyrextechs.com/share/BSKak5jy

Not sure if this is frowned upon here and it would be better to host
somewhere else. Please let me know.

Sorry for making another PR I'm new and was unsure of the proper
protocol and messed up my last branch.

Please direct me to any information on the proper ways to help out as I
don't want to create more work for others.

Thanks.

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Co-authored-by: Aemiii91 <[email protected]>

Author: PhyrexTechs

files/20240310/Skraper_Mix_-_Miyoo_Mini_Big_Zoom_by_AchillesPDX.zip

@@ -51,7 +51,7 @@ The `Imgs` folder name is case sensitive (must have a capital `I`). Examples wou
 
 
 - Download template from the Retro Game Handhelds Discord:<br/>
-[Skraper_Mix_-_Miyoo_Mini_Big_Zoom_by_AchillesPDX.zip](https://cdn.discordapp.com/attachments/979073647685795880/1061416580380119081/Skraper_Mix_-_Miyoo_Mini_Big_Zoom_by_AchillesPDX.zip) - _Template by: AchillesPDX_
+[Skraper_Mix_-_Miyoo_Mini_Big_Zoom_by_AchillesPDX.zip](https://github.com/OnionUI/Onion/raw/main/files/20240310/Skraper_Mix_-_Miyoo_Mini_Big_Zoom_by_AchillesPDX.zip) - _Template by: AchillesPDX_
 - Extract the _.ZIP_ file into the following _Skraper_ folder: `.\Skraper-#.#.#\Mixes\`
 - Via the "ALL SYSTEMS"selection on the left, go to the "_MEDIA_" tab -> Clear the "_Fetched Media List_" of all but one image type by pressing the "_minus_" button.
 - Change the "_Media type:_" to: "_USER PROVIDED MIX_" and click on the file icon to the right