Support alternative formatting for [indented] ordered lists

[patcon]

GitHub by default uses a different format at each level of a nested ordered list:

1. testing
   1. child
      1. grandchild
   2. back to this child

Would it be possible for hackmd to support the same thing? (It would make taking meeting notes much easier to follow!) :)

[ccoenen]

you can do this as a workaround (example):

<style>
    ol ol {
      list-style: lower-roman;
    }
    ol ol ol {
      list-style: lower-latin;
    }
</style>
1. test
1. test 2
    1. child 2.1
        1. grandchild 2.2
    1. subtest 2.2
    1. subtest 2.2
1. test 3

[ccoenen]

If anyone wants to make a pull request adding those (or similar) styles, I think that would be accepted. The current "numbers only" can get a little confusing.

[SISheogorath]

~I would say the renumbering is actually an upstream issue. It should be done here: https://github.com/codemirror/CodeMirror/blob/c9ea0ee56ea65c17150b92e50539dafc6515aba4/addon/edit/continuelist.js~

Edit: The part above landed in the wrong issue. Sorry for that.

The styling part is on the hackmd side.