Hi thanks for replying!
Basically it's just a set of .php files in three folders called 'content' 'html' and 'seo'. And in images folder, with in the root of all a .index.php and style.css.
What I wanted was to build a .html website but I didn't want to have to edit every page when changing something e.g. in the footer or menu. In the past I used iframes, but apparently search engines don't support it much and it may cause issues with responsiveness.
So, now I have .php files which 'convert' to .html extension. Basically I needed the 'include file' thing as a replacement for the iframe, so that's why it had to be .php files instead of .html files.
Hope that explains it a bit more. Like I said, there's no database or anything.
Yes, in my editor it looks like the paths are all 'relative', I don't have any 'full' links that include the domain name AND the .html file path. If that's what you meant.
Now, I have some things set in the DirectAdmin of my host:
Force redirect: No redirection
Redirect HTTP to HTTPS: YES
Private_html setup (SSL): Use a symbolic link from private_html to public_html - allows for same data in http and https: YES
Just listed that data to be sure it won't interfere with your provided .htaccess code?
Hey, thanks!