* Moving the sync command to the Tab mode
* Fixing bug related to plugin panes and sync mode
When sync mode was enabled the input from a plugin pane was being
incorrectly ignored.
* Configuration is now handled in this order:
--config flag
ZELLIJ_CONFIG_FILE env
get_default_config_dir() (directories-next)
HOME/.config/zellij (for mac convenience)
SYSTEM_DEFAULT_CONFIG_DIR (for distributions to specify sensible
defaults ontop of zellij)
from assets
* Fix default.yaml file
* Move default.yaml file to assets directory