Changed Slay the Jokers' setup instructions to be compatible with the Mod Manager (#243)

The main change is the upload key path written in the setup instructions
- the old setup used an upload key file path that was overwritten by the
Mod Manager each update. The path was moved to the `Balatro` data folder
to solve that, so the description needs to be updated too.

The smaller change is adding a note about not closing the black window
(some users that were new to the Mod Manager closed it, stopping the
uploads)

mods/its-edalo@slay-the-jokers/description.md

@@ -12,8 +12,11 @@ If you need help or have suggestions feel free to contact me at itsedalo@gmail.c
         - Absolutely no need for anything formal or polite, you can just say `Hi, I'm <twitch name>, give me a key.`, word for word if you want. I'll try to send you the key quickly.
     - Use the automated system at https://edalo.net/stj/get-key (you will need to verify your Twitch account to prove it's really you)
         - This feature is new; if something fails, fall back to emailing me
-2. Place `upload.key` in the mod folder (Usually `%appdata%\Balatro\Mods\slay-the-jokers-main` or similar)
-3. Enable the [extension](https://dashboard.twitch.tv/extensions/iaofk5k6d87u31z9uy2joje2fwn347) on your Twitch channel
+2. Place `upload.key` in the `Balatro` data directory (`%appdata%\Balatro`)
+3. Launch Balatro and wait for it to fully load
+    - A black command window (part of `Lovely`) will appear - don't close it
+    - On first launch, it will automatically install required tools for this mod
+4. Enable the [extension](https://dashboard.twitch.tv/extensions/iaofk5k6d87u31z9uy2joje2fwn347) on your Twitch channel
 
 ## Things to Know Before Installing
 - **Stream Overlays**: This mod currently only works correctly if the game is shown at a 16:9 resolution (like 1920x1080 / 4K / 8K) and **fills the entire visible area of the stream**. Overlays that crop or reposition the game may cause card positions to misalign.
@@ -33,4 +36,4 @@ If you need help or have suggestions feel free to contact me at itsedalo@gmail.c
 
 ---
 
-If anything is unclear or you run into issues, try referring to the [full installation guide](https://github.com/its-edalo/slay-the-jokers/blob/main/INSTALL.md).
+If anything is unclear or you run into issues, try referring to the [full installation guide](https://github.com/its-edalo/slay-the-jokers/blob/main/INSTALL.md).