Add alt text to the Harpswell post

content/photos/2022/10/harpswell-sunset/index.md

@@ -9,6 +9,10 @@ locations:
     - Maine
     - New England
     - United States
+resources:
+    - name: sunset
+      alt: "The sun sets over an inlet on Casco Bay. In the foreground is a fence, with a tidal mudflat beyond. There are several people out on the mudflat. There's another strip of land in the far distance, and a few boats moored to bouys in the water."
+      src: IMG_0380.jpeg
 ---
 
 Maine did not disappoint on our last full day in Harpswell. The sunset was