yes you can, give it the name index.html and it becomes to your "new" starting pages. To adapt your links you could use DW's "find and replace".
If you defined a local site folder in DW, it can manage your links for you.
From the Files Panel, right click on the filename, select Edit, Rename.
Type index.html, hit Enter.
DW will ask if you want to update your links. Hit Yes.