README: Update the plugins number and link the plugins site
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In a nutshell, Jenkins is the leading open-source automation server.
-Built with Java, it provides over 1000 plugins to support automating virtually anything,
+Built with Java, it provides over 1600 [plugins](https://plugins.jenkins.io/) to support automating virtually anything,
so that humans can actually spend their time doing things machines cannot.
# What to Use Jenkins for and When to Use It
