tmux: adjust tmux to use with planck

tmux/.tmux.conf

@@ -1,5 +1,10 @@
 # NOTE: First of all install TPM
 # git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
+unbind-key C-b
+
+set-option -g prefix C-a
+
+bind-key C-a send-prefix
 
 # Set the base index for windows to 1 instead of 0.
 set -g base-index 1
@@ -36,6 +41,10 @@ set -g status-left ''
 set -g status-right ''
 set -g status-justify centre
 
+# Planck
+bind-key "'" split-window -h
+bind-key "p" split-window -v
+
 # => Bindings
 # Kill pane without confirmation
 bind-key x kill-pane