Update og:image URLs in index.html

Align the changes with firecamp-dev/website#5

Author: Siddhant-K-code

templates/index.html

@@ -20,7 +20,7 @@
       property="og:description"
       content="Build APIs 3x faster with Firecamp's features like team collaboration, API documentation, API collection etc. Boost your confidence to build APIs for millions of users with Firecamp's simple, powerful, and open-source platform."
     />
-    <meta property="og:image" content="https://firecamp.io/og.png" />
+    <meta property="og:image" content="https://firecamp.io/og.jpg" />
 
     <!-- Twitter Meta Tags -->
     <meta name="twitter:card" content="summary_large_image" />
@@ -34,7 +34,7 @@
       name="twitter:description"
       content="Build APIs 3x faster with Firecamp's features like team collaboration, API documentation, API collection etc. Boost your confidence to build APIs for millions of users with Firecamp's simple, powerful, and open-source platform."
     />
-    <meta name="twitter:image" content="https://firecamp.io/og.png" />
+    <meta name="twitter:image" content="https://firecamp.io/og.jpg" />
 
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta