Help to transforming hyperlinks

[alixira]

Hello,
I'm using your sofwater to turn simple wordpress websites into static html. Everything works fine however I need to change some URLs.
I tried to understand but regular expressions are very difficult for me. 
I need to know how to:
1) remove the word index.html in each link
Example: in the online website: www.site.com/name-page/ after download -> /name-page/index.html how to remove index.html?

2) leave unchanged or change the domain site name
Example: in the online website: www.site.com/name-page/ after download -> /name-page/index.html -  I need: www.site.com/name-page/ or www.newsitename.com/name-page/

3) always in the links, rename some words with the relative directories
Example: rename /wp-includes/ to /includes/ or
https://www.sitename.com/wp-content/themes/avada/css/style.css to https://www.sitename.com/content/themes/mytheme/css/style.css

I hope I have been clear enough,
and I thank you very much in advance for the help you will give me.