update links to social media

Author: Song-Jingyu

docs/index.html

@@ -90,6 +90,14 @@
            <!-- use smaller title size -->
           <h1 class="title is-3 publication-title">OceanSim: A GPU-Accelerated Underwater Robot Perception Simulation Framework</h1>
           <h2 class="subtitle is-4">Beta Release Available Now</h2>
+          <!-- Featured by NVIDIA Robotics -->
+          <p class="has-text-centered" style="color:red; font-size:1.1em; font-weight:bold;">
+            <a href="https://www.linkedin.com/posts/nvidiarobotics_robotics-underwaterrobotics-simulation-activity-7313986055894880257-Dfmq?utm_source=share&utm_medium=member_desktop&rcm=ACoAACB8Y7sB7ikB6wVGPL5NrxYkNwk8RTEJ-3Y"
+              target="_blank"
+              style="color:red; text-decoration:underline;">
+              featured by NVIDIA robotics
+            </a>
+          </p>
           <div class="is-size-5 publication-authors">
             <span class="author-block">
               <a href="https://song-jingyu.github.io/">Jingyu Song</a><sup>1*</sup>,</span>
@@ -130,15 +138,15 @@ <h2 class="subtitle is-4">Beta Release Available Now</h2>
           <div class="column has-text-centered">
             <div class="publication-links">
               <!-- PDF Link. -->
-              <span class="link-block">
+              <!-- <span class="link-block">
                 <a href="https://arxiv.org/pdf/2503.01074"
                    class="external-link button is-normal is-rounded is-dark">
                   <span class="icon">
                       <i class="fas fa-file-pdf"></i>
                   </span>
                   <span>Paper</span>
                 </a>
-              </span>
+              </span> -->
               <span class="link-block">
                 <a href="https://arxiv.org/abs/2503.01074"
                    class="external-link button is-normal is-rounded is-dark">
@@ -167,6 +175,27 @@ <h2 class="subtitle is-4">Beta Release Available Now</h2>
                   </span>
                   <span>Code</span>
                   </a>
+              </span>
+                <!-- New Twitter placeholder -->
+              <span class="link-block">
+                <a href="https://x.com/justsimonjust/status/1907793513183367232"
+                  class="external-link button is-normal is-rounded is-dark">
+                  <span class="icon">
+                    <i class="fab fa-twitter"></i>
+                  </span>
+                  <span>X/Twitter</span>
+                </a>
+              </span>
+
+              <!-- New LinkedIn placeholder -->
+              <span class="link-block">
+                <a href="https://www.linkedin.com/posts/jingyu-song-93763a132_robotics-underwaterrobotics-simulation-activity-7313545874091958272-qnwC?utm_source=share&utm_medium=member_desktop&rcm=ACoAACB8Y7sB7ikB6wVGPL5NrxYkNwk8RTEJ-3Y"
+                  class="external-link button is-normal is-rounded is-dark">
+                  <span class="icon">
+                    <i class="fab fa-linkedin"></i>
+                  </span>
+                  <span>LinkedIn</span>
+                </a>
               </span>
               <!-- LinkedIn post, use news icon -->
               <!-- <span class="link-block">