fix npm command

Author: Marcin

docs/getting-started/stage-one.mdx

@@ -23,7 +23,7 @@ To install package run below command
 <Tabs>
   <TabItem value="npm" label="npm" default>
     ```bash
-    npm --save @mapgrab/map-interface
+    npm i --save @mapgrab/map-interface
     ```
   </TabItem>
   <TabItem value="yarn" label="yarn">

docs/getting-started/stage-two/cypress.mdx

@@ -15,7 +15,7 @@ import TabItem from "@theme/TabItem";
 <Tabs>
   <TabItem value="npm" label="npm" default>
     ```bash
-     npm --save @mapgrab/cypress
+     npm i --save @mapgrab/cypress
     ```
   </TabItem>
   <TabItem value="yarn" label="yarn">

docs/getting-started/stage-two/playwright.mdx

@@ -15,7 +15,7 @@ import TabItem from "@theme/TabItem";
 <Tabs>
   <TabItem value="npm" label="npm" default>
     ```bash
-     npm --save @mapgrab/playwright
+     npm i --save @mapgrab/playwright
     ```
   </TabItem>
   <TabItem value="yarn" label="yarn">