Fix links to rules documentation and Node API in README (#857)

* Fix link to rules in README

* Fix Node API link

Co-authored-by: Thomas Lindner <5178550+tclindner@users.noreply.github.com>

README.md

@@ -21,7 +21,7 @@ Currently it can check for:
 * the presence of a pre-release version of a module
 * and much more!
 
-Please see the [website](https://npmpackagejsonlint.org/docs/en/rules) for a list of rules.
+Please see the [website](https://npmpackagejsonlint.org/docs/rules) for a list of rules.
 
 ## How do I install it?
 
@@ -50,7 +50,7 @@ First thing first, let's make sure you have the necessary pre-requisites.
 
 Quick links
 
-[CLI commands and configuration](https://npmpackagejsonlint.org/docs/cli) | [Node.js API](https://npmpackagejsonlint.org/docs/en/api)
+[CLI commands and configuration](https://npmpackagejsonlint.org/docs/cli) | [Node.js API](https://npmpackagejsonlint.org/docs/api)
 
 ## Migrating from v5.x.x to 6.x.x