Refresh, document, and "relaunch" the kernel monitor feature

[BenRussert]

@kylebarron pointed out that the kernel monitor component is not documented and probably a feature that is missed by many users who would find it useful.

To try this out, you can run "Hydrogen: Toggle Kernel Monitor" when you have kernel(s) running. I love this feature personally.

I'd also like to add some styling to the component and maybe make some enhancements to it for untitled files after #1540.

• Add to a page (or add a page) to the gitbook showing this feature
• Let users know about it on social media and mention again in release notes 📢
  • Maybe add to README.md ?

Potential enhancements:

• Add active-kernel and active-file class for optional styling (i'll elaborate later)
• Allow user to click on a filename/kernel reference to activate that editor
• Add a column for other info, such as execution_count, kernel spec info, or other useful info
• Consider overlap with status-bar/kernel commands and make them work together nicely

[BenRussert]

I'm sure I'll get to this at some point, but not before the next release (planning on shipping this week)

[aviatesk]

Hi @BenRussert
I'm interested in this feature enhancement too. I use this a lot in daily use.

I've tried to tweak around this feature and so far I've implemented:

• click on a file to jump to it (just pop-up a warning for unsaved editors)
• add icons to restart/interrupt kernels (Of course I did implement tooltips on hover)
  

So, can I make a PR about this ? I want to take some feedback / review from maintainers before proceeding more.

I also want to try execution_count or kernelspec stuff and the refactoring for optional styling, and even more documentation.

[BenRussert]

@aviatesk, sounds good to me! Please do make a PR! You can do so whenever you're ready and just put "WIP" in the title if you are still working on it.

[aviatesk]

@BenRussert
Thanks for getting me back !
Sure, I'll make a PR within a week 😉