Prevent images from being treated as text in markdown (#1119)

assets/styles/components.scss

@@ -616,6 +616,7 @@
   img {
     max-width: 100%;
     height: auto;
+    vertical-align: middle;
   }
 
   html:not(.dark-mode, .oled-mode) & img[src$='#gh-dark-mode-only'] {