Site: use pure javascript slugification library

This library doesn't support languages but it has only 2 dependencies being free from native dependencies

Closes #2508

Author: mindrones

site/README.md

@@ -29,4 +29,4 @@ BASEURL=http://localhost:3000
 
 Anchors are automatically generated using headings in the documentation and by default (for the english language) they are latinised to make sure the URL is always conforming to RFC3986.
 
-If we need to translate the API documentation to a language using unicode chars, we can setup this app to export the correct anchors by setting up `SLUG_PRESERVE_UNICODE` to `true` and `SLUG_LANG` to the ISO 639-1 two-letter language code of your choice in `config.js`.
+If we need to translate the API documentation to a language using unicode chars, we can setup this app to export the correct anchors by setting up `SLUG_PRESERVE_UNICODE` to `true` in `config.js`.

site/config.js

@@ -1,3 +1,2 @@
 export const SLUG_PRESERVE_UNICODE = false;
 export const SLUG_SEPARATOR = '_';
-export const SLUG_LANG = 'en';