feat: update Open Graph and Twitter meta tags to use local image paths

Author: ErwanDecoster

index.html

@@ -12,13 +12,13 @@
     <meta property="og:url" content="https://explorer.iex.ec/" />
     <meta property="og:title" content="iExec Explorer" />
     <meta property="og:description" content="Discover, search and analyze iExec assets, deals, tasks, and more." />
-    <meta property="og:image" content="https://explorer.iex.ec/og-image.png" />
+    <meta property="og:image" content="/src/assets/og-image.png" />
     <!-- Twitter -->
     <meta name="twitter:card" content="summary_large_image" />
     <meta name="twitter:url" content="https://explorer.iex.ec/" />
     <meta name="twitter:title" content="iExec Explorer" />
     <meta name="twitter:description" content="Discover, search and analyze iExec assets, deals, tasks, and more." />
-    <meta name="twitter:image" content="https://explorer.iex.ec/og-image.png" />
+    <meta name="twitter:image" content="/src/assets/og-image.png" />
     <!-- End of useful meta tags -->
     <link rel="icon" type="image/svg+xml" href="/src/assets/logo.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />