YouTube video will now show thumbnail when exported to a media that do not support video. (PR #9086)

Add warning when running `ipython <subcommand>` when subcommand is deprecated. `jupyter` should now be used.

Code in `%pinfo` (also known as `??`) are now highlighter (:ghpull:`#8947`)

`%aimport` now support module completion. (:ghpull:`#8884`)

`ipdb` output is now colored ! (:ghpull:`#8842`)

Add ability to transpose columns for completion: (:ghpull:`#8748`)

Many many docs improvements and bug fixes, you can see the list of changes [add link to GitHub diff]