Hi there will be an API in Confluence that will allow me to display my documents on an external web page ???.
There is an API in Confluence that will allow you to get access to your Confluence data. As to what you do with that data (show it on an external web page, send it to somewhere else, etc.), that’s up to you.
To access the data, you’d want to use the REST API found in the SDK here: REST API development
Here is a great getting started page on the SDK: Getting started