Fix autocommands, allow undo indent

[champignoom]

This PR allows undoing the indenting upon leaving insert mode.

For example:

* heading
        type something with custom indent here

After typing the last line with cursor just after "here", press <Esc>, then it becomes

* heading
  type something with custom indent here

Sometimes this is not wanted. Now the indenting can be reverted by u to

* heading
        type something with custom indent here

[champignoom]

I don't understand how https://github.com/nvim-neorg/neorg/commit/fd6d0bf99b64e761b0f028f2673bfdd41becfb92 got merged.

[max397574]

I don't understand how fd6d0bf got merged.

there are like two different commits pointing to that pr perhaps there were some rebasing mistakes

[vhyrro]

Yeeah it seems like a rebase messed something up. The PR looks good to me! If there's nothing else to do you can undraft it and I'm fine to merge.

[champignoom]

I might have encountered a problem of code blocks but I can't reproduce nor remember it anymore, so yes, it's mergeable.

[champignoom]

I re-encountered the problem:

     @code rust
     #[a="
"]
     @end

The line "] has negative indentation relative to the code block.