Update styling page and add tabicon option

features/appearance.mdx

@@ -4,6 +4,27 @@ description: 'Wave lets you customize the look and feel of your terminal'
 icon: 'paintbrush'
 ---
 
+<img height="200" src="/path/appearance.gif" />
+
+
 ## Tab Settings
+You can customize each tab when you create it or by using the tab settings after creation. Tabs can also be customized from the command line. 
+
+Example:
+```
+/screen:set name="prod"
+/screen:set tabcolor=red
+/screen:set tabicon=fire
+```
+
+See the full list of options for the [/screen:set](https://docs.waveterm.dev/reference/slashcommands#screen-set) slashcommand.
 
 ## Workspace Settings
+You can customize the name of each workspace from the workspace settings or from the command line. 
+
+Example:
+```
+/session:set name="python development"
+```
+
+See the full list of options for the [/session:set](https://docs.waveterm.dev/reference/slashcommands#session-set) slashcommand.

reference/slashcommands.mdx

@@ -183,18 +183,19 @@ Updates screen parameters
 
 ```
 Usage:
-/screen:set [name=name] [tabcolor=color]
+/screen:set [name=name] [tabcolor=color] [tabicon=icon]
 /screen:set [anchor=anchor] [focus=focus] [line=line]
 ```
 
 Options:
 
-* name - set the name of the screen in the tab bar
-* tabcolor - set the color of the tab
-* anchor - sets the current scroll anchor position (used by client)
-* focus - sets the focus type for the screen (used by client) ("input" or "cmd")
-* line - sets the currently selected line
-* sharename - sets the sharename for web sharing
+* `name` - set the name of the screen in the tab bar
+* `tabcolor` - set the color of the tab
+* `tabicon` - set the icon of the tab
+* `anchor` - sets the current scroll anchor position (used by client)
+* `focus` - sets the focus type for the screen (used by client) ("input" or "cmd")
+* `line` - sets the currently selected line
+* `sharename` - sets the sharename for web sharing
 
 ### /screen:showall