In case anyone else like me gets to this post and wonder about that converter Shashi is mentioning:
Connect with Adobe, they have a html converter in place using which you can keep aem sites intact but use EDS for website delivery which will convert aem hosted html to eds sematic html
I recently met with someone from Adobe who explained me that they have removed that converter because of the issues they experienced with different clients. If you are still curious about it, they based that converter on this: https://github.com/suntong/html2md.
Therefore, Adobe does not recommend that approach anymore for AEM-Based authoring. Instead, you should recreate your project using Edge Delivery Services Crosswalk project.