Add SponsorLink v2

Related to #139

Attempt to improve SEO by adding to description/readme

See if we can dethrone HtmlAgilityPack :)

Explicitly mention web scraping in description for better SEO

Remove current implementation of SponsorLink for now

Now that SponsorLink is OSS and based on received feedback
it will change in many ways moving forward, we'll for now
remove the current implementation from the package to address
the issues that were raised.

See https://github.com/devlooped/SponsorLink

💟 Add SponsorLink to ensure ongoing maintenance

+Mᐁ includes

+M▼ includes

Need minor bump to depend on non-beta

Publishing the previous one to nuget.org with the dependency on the Web-beta was a mistake :(