Added Salesfly PDF API

Added Coronavirus Graphs API under News section.

Adding Scrapingdog.com . It is a FREE web scraper that handles millions of proxies, browsers and CAPTCHAs to provide you with HTML of any web page in a single API call. It also provides Web Scraper for Chrome & Firefox and a software for instant scraping demands.

* feat: add image-charts

Co-authored-by: Yann Bertrand <5855339+yannbertrand@users.noreply.github.com>

This reverts commit 03d96f8adf.

Co-authored-by: Yann Bertrand <5855339+yannbertrand@users.noreply.github.com>

reformat the submission to follow the alphabet order

PM2.5 Open Data Portal provides open data from the AirBox project, which is a low-cost PM2.5 sensing project. The data frequency is every 5 minute, and there have been more than 15,000 sensors deployed worldwide.

Removed dead links

Remove fullstop

Co-Authored-By: Sandro <sandro.jaeckel@gmail.com>

Updated Gitter URL

Co-Authored-By: James Brooks <james@alt-three.com>