Unify the language identifiers of the code blocks to 'sh' (#1563)

* unify the language identifiers of the code blocks for installation commands to 'shell'

* 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

@@ -41,7 +41,7 @@ $ brew install nushell
 #### Windows:
 
 ```powershell
-$ winget install nushell
+winget install nushell
 ```
 
 ## Community

es/README.md

@@ -38,11 +38,11 @@ $ brew install nushell
 En [Scoop](https://scoop.sh):
 
 ```powershell
-$ scoop install nu
+scoop install nu
 ```
 
 #### Inicia la shell
 
-```
+```sh
 $ nu
 ```

ja/README.md

@@ -41,7 +41,7 @@ $ brew install nushell
 #### Windows:
 
 ```powershell
-$ winget install nushell
+winget install nushell
 ```
 
 ## Nu を Github Actions で利用する

pt-BR/README.md

@@ -38,11 +38,11 @@ $ brew install nushell
 Com [Scoop](https://scoop.sh):
 
 ```powershell
-$ scoop install nu
+scoop install nu
 ```
 
 #### Inicializar o shell
 
-```
+```sh
 $ nu
 ```

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。