fix: update readme to include storybook instructions

README.md

@@ -75,19 +75,17 @@ To start the storybook in a local server use `yarn start`.
 
 ## How to run the storybook
 
-:bulb: **In this case, it's best to run using `npm`!**
-
 Just follow the steps listed below and you will be able to run the storybook.
 
-1. After the checkout to the `vNext` branch, in order to install the dependencies run the command `npm i` on the root;
-2. Now, run the command `cd storybook` to enter the storybook folder, then again run the command `npm i` to install the dependencies inside the storybook folder;
-3. Finally, run the command `npm run serve` inside the storybook folder.
+1. After the checkout to the `vNext` branch, in order to install the dependencies run the command `yarn install` on the root;
+2. Now, run the command `cd storybook` to enter the storybook folder, then again run the command `yarn install` to install the dependencies inside the storybook folder;
+3. Finally, run the command `yarn serve` inside the storybook folder.
 
 In other words, these are the commands you're going to use in order of execution:
 
 ```
-npm i
+yarn install
 cd storybook
-npm i
-npm run serve
+yarn install
+yarn serve
 ```