Fix dropped albums list - remove duplicates and correct data

- Removed 15 albums incorrectly marked as dropped that are still in main list
- Fixed White Album duplication (was listed at both rank 29 and 502)
- Beatles albums Sgt. Pepper's (#24) and White Album (#29) are NOT dropped
- Final dropped albums: 7 genuinely removed albums (ranks 501-507)
- Updated JavaScript validation for correct range (1-507)
- Removed unnecessary cover art files for incorrectly marked albums

Correctly identifies only truly dropped albums from 2020→2023

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

script.js

@@ -416,8 +416,8 @@ function handleJumpToRank() {
         jumpToRank.value = '1';
     } else {
         rank = parseInt(inputValue);
-        if (isNaN(rank) || rank < 1 || rank > 523) {
-            alert('Please enter a valid rank between 1 and 523');
+        if (isNaN(rank) || rank < 1 || rank > 507) {
+            alert('Please enter a valid rank between 1 and 507');
             return;
         }
     }