documentation: Remove outdated icons

docs/configuration/dns/index.md

@@ -1,7 +1,3 @@
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-icon: material/new-box
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-
 !!! quote "Changes in sing-box 1.9.0"
 
     :material-plus: [client_subnet](#client_subnet)

docs/configuration/dns/index.zh.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! quote "sing-box 1.9.0 中的更改"
 
     :material-plus: [client_subnet](#client_subnet)

docs/configuration/dns/server.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! quote "Changes in sing-box 1.9.0"
 
     :material-plus: [client_subnet](#client_subnet)

docs/configuration/dns/server.zh.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! quote "sing-box 1.9.0 中的更改"
 
     :material-plus: [client_subnet](#client_subnet)

docs/configuration/experimental/cache-file.md

@@ -1,7 +1,3 @@
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-icon: material/new-box
----
-
 !!! question "Since sing-box 1.8.0"
 
 !!! quote "Changes in sing-box 1.9.0"

docs/configuration/experimental/cache-file.zh.md

@@ -1,7 +1,3 @@
----
-icon: material/new-box
----
-
 !!! question "自 sing-box 1.8.0 起"
 
 !!! quote "sing-box 1.9.0 中的更改"