docs: highlight powershell in vuepress (#2147)

README.md

@@ -202,7 +202,7 @@ shown below. Can't see yours? Have a look at the [extra platform instructions](h
 
    Add the following to the end of `Microsoft.PowerShell_profile.ps1`. You can check the location of this file by querying the `$PROFILE` variable in PowerShell. Typically the path is `~\Documents\PowerShell\Microsoft.PowerShell_profile.ps1` or `~/.config/powershell/Microsoft.PowerShell_profile.ps1` on -Nix.
 
-   ```sh
+   ```powershell
    Invoke-Expression (&starship init powershell)
    ```
 

docs/config/README.md

@@ -29,7 +29,7 @@ export STARSHIP_CONFIG=~/.starship
 
 Equivalently in PowerShell (Windows) would be adding this line to your `$PROFILE`:
 
-```ps1
+```powershell
 $ENV:STARSHIP_CONFIG = "$HOME\.starship"
 ```
 
@@ -44,7 +44,7 @@ export STARSHIP_CACHE=~/.starship/cache
 
 Equivalently in PowerShell (Windows) would be adding this line to your `$PROFILE`:
 
-```ps1
+```powershell
 $ENV:STARSHIP_CACHE = "$HOME\AppData\Local\Temp"
 ```