Reusing markdown docs from github repo in Zola site

Support
13

From your envsetup.sh:

      if [ "$file_name" = "README.md" ]; then
        cp "$f" "$dest/_index.md"
      else
        cp "$f" "$dest/"
      fi

I’ve written lines like that in the past, maybe that would be worth implementing it into zola. Many development projects use README.md from submodules as either page or section index file, one way or another. Maybe we could have a setting like:

[content]
section_index = [ "_index.md" ]
page_index = [ "index.md" ]

I initially thought that each setting should be a String, which would be easier to implement. I settled for a Vec<String> because using some README.md does not mean all sections are structured in the same way (slightly more difficult because it can introduce output path conflicts).

Maybe ignored_content settings could go in there as well? Slightly off-topic, but i really like the recent move of top-level settings to dedicated tables. Going further down this road would make understanding the config a lot easier for newcomers, and the documentation easier to extend/maintain.