docs: update pages with the new media for testing zensical

docs/fetching/dynamic.md

@@ -122,9 +122,9 @@ page = DynamicFetcher.fetch('https://example.com', proxy='http://username:passwo
 ### Downloading Files
 
 ```python
-page = DynamicFetcher.fetch('https://raw.githubusercontent.com/D4Vinci/Scrapling/main/images/poster.png')
+page = DynamicFetcher.fetch('https://raw.githubusercontent.com/D4Vinci/Scrapling/main/images/main_cover.png')
 
-with open(file='poster.png', mode='wb') as f:
+with open(file='main_cover.png', mode='wb') as f:
     f.write(page.body)
 ```
 

docs/fetching/static.md

@@ -275,8 +275,8 @@ def scrape_products():
 ```python
 from scrapling.fetchers import Fetcher
 
-page = Fetcher.get('https://raw.githubusercontent.com/D4Vinci/Scrapling/main/images/poster.png')
-with open(file='poster.png', mode='wb') as f:
+page = Fetcher.get('https://raw.githubusercontent.com/D4Vinci/Scrapling/main/images/main_cover.png')
+with open(file='main_cover.png', mode='wb') as f:
    f.write(page.body)
 ```