Use abp install-libs command in docs.

docs/en/Community-Articles/2020-05-29-Real-Time-Messaging-In-A-Distributed-Architecture-Using-Abp-Framework-SingalR-RabbitMQ/POST.md

@@ -168,7 +168,7 @@ namespace SignalRTieredDemo.Web
     {
 ````
 
-Also, we need to add [@abp/signalr](https://www.npmjs.com/package/@abp/signalr) npm package to package.json in ***.Web** project, then run **yarn** and **gulp** commands.
+Also, we need to add [@abp/signalr](https://www.npmjs.com/package/@abp/signalr) npm package to package.json in ***.Web** project, then run **abp install-libs** command.
 
 `````json
 {

docs/en/Community-Articles/2020-08-18-Using-DevExtreme-Components-With-The-ABP-Framework/Using-DevExtreme-Components-With-The-ABP-Framework.md

@@ -79,7 +79,9 @@ module.exports = {
 
 Open your `DevExtremeSample.Web` project folder with a command line and run the `gulp` command. This command will copy the needed library files into the ``/wwwroot/libs/devextreme/` folder.
 
-![gulp](gulp.png)
+````bash
+abp install-libs
+````
 
 You can see `devextreme` folder inside the `wwwroot/libs`:
 

docs/en/Community-Articles/2021-03-12-Simple-SignalR-Notification/POST.md

@@ -91,7 +91,7 @@ You can install the latest version (3.1.13 will be old)
 
 #### 3- Add resource Mapping
 
-We added SignalR to the `package.json` but it comes into your `node_modules` folder. We need to copy the related files to `wwwroot/libs` folder. To do this copy the content of the following file to your `abp.resourcemappings.js` file. It's in your root directory of Web folder. After you do this, go to your web directory and run `gulp` command. By doing this, it'll copy the related files into your `wwwroot/libs` folder.
+We added SignalR to the `package.json` but it comes into your `node_modules` folder. We need to copy the related files to `wwwroot/libs` folder. To do this copy the content of the following file to your `abp.resourcemappings.js` file. It's in your root directory of Web folder. After you do this, go to your web directory and run `abp install-libs` command. By doing this, it'll copy the related files into your `wwwroot/libs` folder.
 
 [abp.resourcemappings.js](https://gist.github.com/ebicoglu/f7dc22cca2d353f8bf7f68a03e3395b8#file-abp-resourcemapping-js)