feat: grey out broken links

content/_index.md

@@ -2,12 +2,13 @@
 title: 🪴 Quartz 3.1
 ---
 Host your second brain and [digital garden](https://jzhao.xyz/posts/digital-gardening) for free. Quartz features
-1. Extremely fast full-text search by pressing `/`
-2. Display for backlinks of each note
-3. Fully customizable local graph view
-4. Endlessly powerful page and theme customization using CSS
-5. Automatically generated tag and section lists of content
-6. Beautiful link previews
+1. Extremely fast full-text search by pressing `ctrl` + `k`
+2. Wikilink support
+3. Display for backlinks of each note
+4. Fully customizable local graph view
+5. Endlessly powerful page and theme customization using CSS
+6. Automatically generated tag and section lists of content
+7. Beautiful link previews
 
 ## Get Started
 > 📚 [Setup your own digital garden using Quartz](notes/setup.md)
@@ -18,7 +19,7 @@ Not convinced yet? Look at some [community digital gardens](notes/showcase.md) b
 If you prefer browsing the contents of this site through a list instead of a graph, you can find content lists here too:
 
 - [All Notes](/notes)
-- [Setup-related Notes](/tags/setup)
+- [Setup-related Notes](/tags/set)
 
 ## Troubleshooting
 - 🚧 [Troubleshooting and FAQ](notes/troubleshooting.md)