Removed MIME Type Column from supported list

[devilkadabra69]

new colums are ->Index, Content Type Label ,Description

[nhonx]

We also need to remove the Column from here as well: https://github.com/google/magika/blob/a9d3904fbe1523c740ecb20ebf0e742e4acf5892/python/magika/cli/magika.py#L432 It's shown when user use magika --list-output-content-types

[reyammer]

Thanks for the PR folks! The issue I've created was more of a "think about it" rather than "let's do it for sure" :-) but I still think it's a good idea. Maybe we should add a short discussion at the beginning or end of the table to justify this / point whoever sees the table to the discussion on output format. I need to think a bit about this...

[devilkadabra69]

i guess i missed headers part ! i'll fix it quickly

[reyammer]

Thanks!