docs(windows): add missing win-node-env dependency in the installatio…

…n steps (#912)

docs/getting-started/buildfromsource.mdx

@@ -248,6 +248,7 @@ git checkout main
 ```
 3. Install the dependencies:
 ```powershell
+npm install -g win-node-env
 set CYPRESS_INSTALL_BINARY=0 && yarn install --frozen-lockfile --network-timeout 1000000
 ```
 4. Build the project: