feat: No img src to external URL

This is useful if we want to expose this service to the Tor network
because browsers usually refuse serving images from https protocol
to insecure http protocol.

frontend/src/routes/remote-nodes/+page.svelte

@@ -273,9 +273,8 @@
 				</li>
 				<li>
 					Malicious actors who running remote nodes <a
-						class="external"
-						href="https://w3-s3-jkt1.ditatompel.com/pub/assets/img/site-contents/monero-tx-fee-node.jpg"
-						target="_blank"
+						class="link"
+						href="/img/node-tx-fee.jpg"
 						rel="noopener">still can return high fee only if you about to create a transactions</a
 					>.
 				</li>