add the ability to toggle boolean options with a cli flag:
example:
if the pane frames are turned off in the config file,
then passing in the `--no-pane-frames` flag will toggle the
pane frames on
* feat: add session configuration to layout template
WIP: prototyping for issue #611
* test(layout): add session name
* feat(layout): add cond flow to check session name
* feat(layout): update session
* feat: add function to attach a session
* fix(layout): update feedback
* attach option only works when layout template exists.
* feat(layout): add conditional for session-layout
* update default attach value
* fix(main): Remove unnecessary pub visibility from the main function in `src/main.rs`
* fix(main): Avoid unnecessary if-evaluations in the main function of `src/main.rs`
* fix(commands): Simplify kill_all_sessions
