[RFE] Presentation mode

[saaj]

As a user of Sqliteviz,
In order to demonstrate a prepared visualisation(s),
I want to be able to hide all other controls and keep only the chart(s) on the screen.

In general the separate "edit" and "presentation" seem to makes sense in the context of Sqliteviz.

In case of multiple open tabs, it may a good idea to have a keyboard key for navigation between them (e.g. arrow keys).