#5 Lua filter org mode links need to distinguish between file and web links

Otherwise the lua filter example makes https://foo.org => https://foo.html

I've been thinking about this one for a while. One way, would be to add an extra export step to normalize the output into something more expressive before converting to html. Anyway, here's the pandoc examples.

• https://github.com/pandoc/lua-filters
  
• https://pandoc.org/lua-filters
  
• https://pandoc.org/lua-filters#modifying-pandocs-manual.txt-for-man-pages
  

I added a quick fix in dbb98cfdf9.

But I think there will be edge cases, so I might need to setup a test cases in lua to make sure.