Delete all the index.html file "Directory access is forbidden." when using .htaccess

It won't show the content if you have an .htaccess "Deny from all" in the folder or in the parent folder.

Well, first of all, "Deny from all" is deprecated in Apache v > 2.4 syntax and it should be "Require all denied".

Second, and most important. the "public" folder of a website must be set to "Allow from all" or "Require all granted" or requests for files in that folder (and subfolders) will be denied meaning webpages won't show.