feat(editor): Add reset option to dbee open

[phdah]

~~Adds options to the require('dbee').open( { reset = true } ),~~ which will reset the windows to the fixed size defined in layout config. The reset functionality is now build into the require('dbee').open(), such that:

1. If not yet open, it will open
2. If open, it will reset the layout

A question is if we want it to be hard coded, or dynamically calculated relative to the terminal current size. Any thoughts @MattiasMTS?

Left to do:

• [x] Update to documentation