Add fish, tmux, vim, and git dotfiles; clean up

.tmux.conf

@@ -0,0 +1,18 @@
+set -g default-terminal "xterm-256color"
+setw -g mouse on
+setw -g mode-keys vi
+
+bind j select-pane -D
+bind k select-pane -U
+bind h select-pane -L
+bind l select-pane -R
+
+bind | split-window -h
+bind _ split-window -v
+
+bind -r J resize-pane -D 5
+bind -r K resize-pane -U 5
+bind -r H resize-pane -L 5
+bind -r L resize-pane -R 5
+
+source-file ".tmux-line.conf"