Improved navbar links and responsive design across pages.

### appearances.html
1. Activated "appearances" in the navbar for the whole page instead of "home" and "contact."
2. Improved responsive design: logo and search bar centered below 1020px screen width.
3. Linked the Ironman logo to the index webpage.
4. Added focus to the search bar.

### index.html
1. Fixed navbar overlap issue when "home" or "about" is clicked, ensuring sections appear below the navbar.
2. Centered logo and search bar below 1020px screen width.

### movie.html
1. Fixed dropdown menu functionality below 1020px screen width by adding script.js.
2. Linked "about" and "contact" buttons to index.
3. Linked the logo.

### videos.html
1. Fixed dropdown menu functionality below 1020px screen width by adding script.js.
2. Linked "about" and "contact" buttons to index.
3. Linked the logo.

Appearances.html

@@ -32,7 +32,7 @@
             <button type="submit"><i class="fa-solid fa-magnifying-glass"></i></button>
             </form>
         </div>
-        
+
         <div class="burger">
             <div class="line"></div>
             <div class="line"></div>