Add "index.html" export mode

[KosmosisDire]

This would add an option alongside the "web styled file names" option, which would create a seperate folder for every file with the file's name and rename each exported file to index.html inside the folder. This would let each file be under a folder path instead of a file path. aka no .html at the end of the url.

[Regenhardt]

This fits my use case exactly, since I'm using obsidian this way too:

A note referencing multiple other notes. Then one of those notes has several other notes that are actually a part of that particular topic but should be their own note, so they go in a folder that has the same name as the topic note.

Example tree of notes:

AI
 -> Search
   -> Informed
   -> Uninformed
 -> Learn
   -> Unsupervised
   -> Supervised
   -> Reinforcement Learning
     -> Cost calculation
     -> Monte Carlo
     -> Temporal Difference Learning
 -> Sequential Data

So here, Searchand Learn both have a markdown file in the root level and a folder with the same name, which then includes notes of that particular topic. The Search folder would include Informed and Uninformed. The Learn folder includes Reinforcement Learning with the overview and general explanation, plus again a folder called Reinforcement Learning which includes the three sub topics.

Of course it's not really a tree and there are lots of circular references, but the folder tree is there and would be nice to have in a website.

Does this also entail an index file for the whole vault? Can we tell the exporter, which note should be the homepage?
In my case, AI, Search, and Learn are all notes in the root directory, but AI should be the homepage for the exported vault.