Consider using tabs instead of spaces for indentation

[vlsi]

Tabs allow better accessibility:

• if someone needs a larger indent (e.g. to recognize the code better), they can adjust tab width
• tab consumes 1 slot on a refreshable braille display while 4 spaces consume 4

See prettier/prettier#7475

On the other hand, the language is tuned for "4 space" indentation, so it would be nice to autoconfigure editors/viewers to "indent_size=4".

Just in case, GitHub recognizes .editorconfig indent_size = 4; indent_style = tab and it would render the file accordingly (see https://stackoverflow.com/a/33831598/1261287 )