fix: remove emojis from section headers for consistency

Author: ErwanDecoster

src/get-started/helloWorld/2-protectData.md

@@ -31,7 +31,7 @@ its entire lifecycle - during storage, transfer and processing.
 
 :::
 
-## 🧩 DataProtector, Key Features
+## DataProtector, Key Features
 
 DataProtector is a developer tool built on top of our technology. It helps
 developers easily add data protection, management, and monetization features to
@@ -53,11 +53,11 @@ their DApp with these key features:
   Features an SDK for easy integration into your DApp, enhancing functionality
   and user experience.
 
-## 🧩 Create protected data
+## Create protected data
 
 <ProtectData />
 
-## 🧩 What Happened Under the Hood
+## What Happened Under the Hood
 
 ::: tip <i></i>
 
@@ -122,7 +122,7 @@ button:
   </div>
 </div>
 
-## 🧩 How to Install and Use DataProtector
+## How to Install and Use DataProtector
 
 Decentralized confidential computing might sound complex, but we've made it
 simple through our developer tools.

src/get-started/helloWorld/3-buildIApp.md

@@ -306,7 +306,7 @@ simulating how it will run in the iExec network's TEE environment.
 
 :::
 
-### 🧩 Using arguments
+### Using arguments
 
 You can pass arguments to your iApp using the `--args` option. This allows you
 to provide necessary inputs during runtime (you can use your name for example).

src/get-started/toolkit.md

@@ -3,12 +3,12 @@ title: iExec Toolkit
 description: Essential tools and resources for building on iExec
 ---
 
-# 🛠️ iExec Toolkit
+# iExec Toolkit
 
 Build faster and smarter with our turnkey toolkit designed to streamline your
 iExec development experience.
 
-## 🚀 iApp Generator
+## iApp Generator
 
 The **iApp Generator** is your quick-start solution for creating iExec
 confidential decentralized applications. Generate production-ready iApp with
@@ -26,7 +26,7 @@ just a few commands, let free your imagination.
 Jump right into building with our comprehensive guide:
 [Building Your iApp →](/references/iapp-generator/building-your-iexec-app.md)
 
-## 🔒 DataProtector-SDK
+## DataProtector-SDK
 
 The **DataProtector-SDK** provides a complete toolkit for managing confidential
 data on iExec. Protect, share, and monetize your data by exposing the protected