Add the Amazon banner

2400x520, the Amazon twin of the LinkedIn banner. The endpoint row reads
/products /reviews /sellers /search, all four present in this SDK, and the
subtitle reads "Collect or discover by ASIN, keyword & UPC", which holds for
the Scraper API and for this repository: collectProducts takes a /dp/ URL
built from an ASIN, and discoverProductsByKeyword and discoverProductsByUPC
are in the endpoint table.

The alt text now says the same as the image. The placeholder written before
the design existed said "URL, keyword and ASIN".

Author: anil-bd

.github/banner.png

@@ -1,8 +1,4 @@
-<!-- The banner belongs here, at .github/banner.png, once it is added to the
-repository. Linking it before the file exists would render a broken image on
-the repository's front page. The alt text and link to restore:
-[![Scrape Amazon data with the Amazon Scraper API: products, reviews, sellers, search. Collect or discover by URL, keyword and ASIN. Start free.](.github/banner.png)](https://brightdata.com/products/web-scraper/amazon?utm_source=github)
--->
+[![Scrape Amazon data with the Amazon Scraper API: products, reviews, sellers, search. Collect or discover by ASIN, keyword and UPC. Start free.](.github/banner.png)](https://brightdata.com/products/web-scraper/amazon?utm_source=github)
 
 # amazon-scraper-node