[Docs] Add documentation for customizing editor interactions

[miroiu]

Describe the issue
There's no documentation about customizing editor interactions.

Additional context
The new system was implemented here: #170

[classyk12]

@miroiu Hi. are you happy with me working on this? I will ensure to update the documentation to be readable and highlight context.

[miroiu]

Hi @classyk12 , I am open to review PRs. Anyone can contribute, without asking for permission.