Use new API page

README.md

@@ -411,7 +411,7 @@ Read the [PostCSS API documentation] for more details about the JS API.
 All PostCSS runners should pass [PostCSS Runner Guidelines].
 
 [PostCSS Runner Guidelines]: https://github.com/postcss/postcss/blob/master/docs/guidelines/runner.md
-[PostCSS API documentation]: http://api.postcss.org/postcss.html
+[PostCSS API documentation]: https://postcss.org/api/
 
 
 ### Options

docs/README-cn.md

@@ -299,7 +299,7 @@ fs.readFile('src/app.css', (err, css) => {
 所有的 PostCSS 运行器应当通过 [PostCSS 运行器指南]。
 
 [PostCSS 运行器指南]: https://github.com/postcss/postcss/blob/master/docs/guidelines/runner.md
-[PostCSS API 文档]:  http://api.postcss.org/postcss.html
+[PostCSS API 文档]:  https://postcss.org/api/
 
 ### 配置选项
 

docs/architecture.md

@@ -141,7 +141,7 @@ So now let's look more closely on structures that play the main role in PostCSS
 
     Processor is a very plain structure that initializes plugins and runs syntax transformations
 
-    It exposes only a few public API methods. Description of them could be found on [api.postcss.org/Processor](http://api.postcss.org/Processor.html)
+    It exposes only a few public API methods. Description of them could be found on [API](https://postcss.org/api/#processor)
 
 - #### Stringifier [`lib/stringify.js`](https://github.com/postcss/postcss/blob/master/lib/stringify.js), [`lib/stringifier.js`](https://github.com/postcss/postcss/blob/master/lib/stringifier.js)
 
@@ -154,4 +154,4 @@ So now let's look more closely on structures that play the main role in PostCSS
 
 ### API Reference
 
-More descriptive API documentation could be found [here](http://api.postcss.org/)
+More descriptive API documentation could be found [here](https://postcss.org/api/)

docs/guidelines/runner.md

@@ -68,7 +68,7 @@ PostCSS runners must not rely on undocumented properties or methods,
 which may be subject to change in any minor release. The public API
 is described in [API docs].
 
-[API docs]: http://api.postcss.org/
+[API docs]: https://postcss.org/api/
 
 
 ## 3. Output

docs/syntax.md

@@ -53,7 +53,7 @@ module.exports = function parse (css, opts) {
 ```
 
 [Safe Parser]: https://github.com/postcss/postcss-safe-parser
-[`Root`]:      http://api.postcss.org/Root.html
+[`Root`]:      https://postcss.org/api/#root
 
 
 ### Main Theory