Add the LinkedIn banner

2400x520, the LinkedIn twin of the Instagram one. The endpoint row and the
subtitle are claims, and both hold: /profiles, /companies, /jobs and /posts
are all in the endpoint table, collect takes URLs, and discover takes a name
or a keyword.

The README line was parked in a comment so the repository front page would not
show a broken image before the file existed. Restored now.

Author: anil-bd

.github/banner.png

@@ -1,9 +1,4 @@
-<!-- The banner belongs here, at .github/banner.png, once design supplies the
-LinkedIn twin of the Instagram one. 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 LinkedIn data with the LinkedIn Scraper API: profiles, companies, jobs, posts. Collect or discover by URL, name and keyword. Start free.](.github/banner.png)](https://brightdata.com/products/web-scraper/linkedin?utm_source=github)
--->
 
 # linkedin-scraper-node