[Feature request]: use slash for formatting

[robvanvolt]

It would be awesome to be able to format using slash + autosuggest

/he

shows

/heading1
/heading2
/heading3

and you can choose one (first by clicking enter, or using arrows / numbers for another) (similar to https://github.com/docmost/docmost).

[brufdev]

You can achieve this quickly using the editor, but I like this approach, so it will probably be included. Thank you for the suggestion.