docs: update stylus installation instructions

* Update README.md

Add proper warning admonition "[!Warning]"

* Update README.md

Switch admonition from Warning to Note

README.md

@@ -38,9 +38,8 @@ https://raw.githubusercontent.com/Dyzean/Tokyo-Night/main/themes/tokyo-night.the
 
 ### Stylus | Extension: [Chrome](https://chrome.google.com/webstore/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne)/[Firefox](https://addons.mozilla.org/en-US/firefox/addon/styl-us)
 
-> ***Important Note!***
->
-> ***To be able to customize this theme, please fork using [this link](https://github.com/Dyzean/Tokyo-Night/fork) and follow the instructions in `tokyo-night.user.css` starting at line 12.***
+> [!Note]
+> To be able to customize this theme, please fork using [this link](https://github.com/Dyzean/Tokyo-Night/fork) and follow the instructions in `tokyo-night.user.css` starting at line 12.
 
 1. Open [this link](https://github.com/Dyzean/Tokyo-Night/blob/main/themes/tokyo-night.user.css) in a new browser tab.
 2. Press the `Install Style` button.