Refactor home page ads into a single file, add corner video ad (#3601)

## Description:

<img width="3608" height="1848" alt="image"
src="https://github.com/user-attachments/assets/86074bff-e648-4db4-a3e9-08d49e433df0"
/>

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

index.html

@@ -174,7 +174,7 @@
         class="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 z-99999"
       ></div>
 
-      <gutter-ads></gutter-ads>
+      <homepage-promos></homepage-promos>
 
       <!-- Main container with responsive padding -->
       <main-layout class="contents">