Update README.md

README.md

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 Discover a wide range of possibilities with UNav-Sim, from exploring underwater terrains to designing and testing autonomous underwater vehicles (AUVs). Whether you're a student, researcher, or hobbyist, this powerful tool will accelerate your learning and experimentation process.
 
-Join the underwater robotics revolution and unleash your creativity with UNav-Sim! 🌊🤖
 
 # Index 
-- [1. Installation](https://github.com/open-airlab/UNav-Sim#1-installation)
-- [2. Running the simulation](https://github.com/open-airlab/UNav-Sim#2-running-the-simulation)
-- [3. UNav-Sim ros navigation stack](https://github.com/open-airlab/UNav-Sim#3-unav-sim-ros-navigation-stack-coming-soon)
+ [1. Installation](https://github.com/open-airlab/UNav-Sim#1-installation)
+ [2. Running the simulation](https://github.com/open-airlab/UNav-Sim#2-running-the-simulation)
+ [3. UNav-Sim ros navigation stack](https://github.com/open-airlab/UNav-Sim#3-unav-sim-ros-navigation-stack-coming-soon)
 
 # 1. Installation
 UNav-Sim relies in Unreal Engine 5 for generating realistic renderings. First, install UE5 and then proceed to install UNav-Sim