refactor: remove Dune Dashboard image from RLC overview

Author: Le-Caignec

src/assets/rlc/dune-dashboard.png

@@ -90,13 +90,6 @@ ecosystem requires RLC:
 - Confidential computations need RLC for execution
 - Staking mechanisms lock RLC, reducing circulating supply
 
-<ImageViewer
-    :image-url-dark="duneDashboard"
-    image-alt="RLC Token Economics Dashboard"
-    link-url="https://dune.com/datawarlock/arbitrum-economics"
-    caption="🔗 Access iExec Dune Dashboard"
-  />
-
 ## 🔄 Getting RLC
 
 You can acquire RLC tokens through several methods:
@@ -158,7 +151,6 @@ Ready to dive into the iExec ecosystem? Here are the next steps:
   monetize your resources
 
 <script setup>
-import ImageViewer from '@/components/ImageViewer.vue';
 import FeatureCard from '@/components/FeatureCard.vue';
 
 // Assets