remove outdated tmux configuration

.tmux.conf

@@ -8,10 +8,6 @@ set -g history-limit 10000
 bind Escape copy-mode
 unbind p
 bind p paste-buffer
-bind -t vi-copy 'v' begin-selection
-bind -t vi-copy 'y' copy-selection
-bind -t vi-copy 'Space' halfpage-down
-bind -t vi-copy 'Bspace' halfpage-up
 
 # vim move keys
 bind h select-pane -L