swap yarn commands for pnpm

Author: Arian04

README.md

@@ -5,37 +5,23 @@ This website is built using [Docusaurus](https://docusaurus.io/), a modern stati
 ### Installation
 
 ```
-$ yarn
+$ pnpm
 ```
 
 ### Local Development
 
 ```
-$ yarn start
+$ pnpm start
 ```
 
-This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
+This command starts a local development server and opens up a browser window. Most changes are reflected live without
+having to restart the server.
 
 ### Build
 
 ```
-$ yarn build
+$ pnpm build
 ```
 
-This command generates static content into the `build` directory and can be served using any static contents hosting service.
-
-### Deployment
-
-Using SSH:
-
-```
-$ USE_SSH=true yarn deploy
-```
-
-Not using SSH:
-
-```
-$ GIT_USER=<Your GitHub username> yarn deploy
-```
-
-If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.
+This command generates static content into the `build` directory and can be served using any static contents hosting
+service.