There's a huge selection of interfaces available that can add and get content from an Alfresco repository.
For example you can import your web projects as a zip file.
Or ftp the files in and out.
Or copy in the files over CIFS.
Or use a WebDav client.
Or use a web script.
Or use the Java Script API
Or the Java API or web services.
And last but not least CMIS.
There's other options as well, but that will get you started…
If you choose to use Alfresco WCM the easiest way is probably to to import your files as a zip. And you can deploy your files out to your runtime environment.