Simplify/clarify the "Made with ♥️" msg in footer

This little Easter egg may have been too subtle and/or confusing. The
strike-through helps clarify my intent, I think.

To support new/changing tailwind classes being added to en.yml, we must
add the path to tailwind.config.js.

app/views/application/_footer.html.erb

@@ -26,8 +26,7 @@
   <small class="text-center text-gray-500 dark:text-neutral-400 lg:order-1">
     &copy; <%= Date.today.year %> Minesweeper Alliance
     <span class="font-sans text-gray-400 dark:text-neutral-500 mx-1">&mdash;</span>
-    Made with <span class="opacity-80"><%= Icon.heart %></span>,
-    on Earth,
-    by the <%= t("footer.maker").sample %>
+    Made with <span class="opacity-80"><%= Icon.heart %></span>
+    by the <%= t("footer.maker_html").sample %>
   </small>
 </div>

config/locales/en.yml

@@ -106,6 +106,6 @@ en:
       chords: Chords are groups of cells that are automatically revealed by clicking on a previously revealed cell (number) for which the corresponding number of surrounding cells have been flagged.
 
   footer:
-    maker:
+    maker_html:
       - alliance.
-      - mines!
+      - <span class="line-through decoration-1">alliance</span> mines!

config/tailwind.config.js

@@ -7,6 +7,7 @@ module.exports = {
     "./app/helpers/**/*.rb",
     "./app/javascript/**/*.js",
     "./app/views/**/*.{erb,html,rb}",
+    "./config/locales/*.yml",
   ],
   theme: {
     extend: {