Add nested ordered list option

[bjtho08]

This PR fulfills the feature requested in #41

[johansatge]

Hi

Thanks a lot for this contribution, looks like a great new option 🙏

We might need to add new unit tests; let me know if you want to do it yourself in this PR; otherwise I can also merge it and add a few myself before releasing a new version of the plugin.

Thanks!

[bjtho08]

I actually have less than 30 minutes of experience with coding in js, so I might not be the right person to write new unit tests 🤣

This was just an experiment to see if I could do it myself by looking at how you had done the rest and taking advantage of AI auto-complete in VS Code 😉

But if you can specify what tests need to be added, I'm willing to give it a go myself. But, if you think it has to be done soon™️, then maybe it's better that you do it yourself 😄

[johansatge]

Thanks! Merged and updated a bit as I just discovered you can always put 1. as prefix (instead of the real number) to generate ordered lists, which makes the code simpler

Test looks like this: https://github.com/johansatge/obsidian-automatic-table-of-contents/pull/45/files