revert 42300f6 and delete $ from PS sections

/pull/1563#issuecomment-2380375367

Author: ghaaj

README.md

@@ -48,8 +48,8 @@ $ nix profile install nixpkgs#nushell
 
 #### Windows:
 
-```shell
-$ winget install nushell
+```powershell
+winget install nushell
 ```
 
 After installing, launch Nu by typing `nu`.

de/README.md

@@ -40,8 +40,8 @@ $ brew install nushell
 
 #### Windows:
 
-```sh
-$ winget install nushell
+```powershell
+winget install nushell
 ```
 
 ## Community

es/README.md

@@ -37,8 +37,8 @@ $ brew install nushell
 
 En [Scoop](https://scoop.sh):
 
-```sh
-$ scoop install nu
+```powershell
+scoop install nu
 ```
 
 #### Inicia la shell

ja/README.md

@@ -40,8 +40,8 @@ $ brew install nushell
 
 #### Windows:
 
-```sh
-$ winget install nushell
+```powershell
+winget install nushell
 ```
 
 ## Nu を Github Actions で利用する

pt-BR/README.md

@@ -37,8 +37,8 @@ $ brew install nushell
 
 Com [Scoop](https://scoop.sh):
 
-```sh
-$ scoop install nu
+```powershell
+scoop install nu
 ```
 
 #### Inicializar o shell

ru/README.md

@@ -40,8 +40,8 @@ $ brew install nushell
 
 #### Windows:
 
-```shell
-$ winget install nushell
+```powershell
+winget install nushell
 ```
 
 После установки запустите Nu, набрав `nu`.

zh-CN/README.md

@@ -40,8 +40,8 @@ $ brew install nushell
 
 #### Windows:
 
-```shell
-$ winget install nushell
+```powershell
+winget install nushell
 ```
 
 完成安装后，输入 `nu` 来启动 Nu。