[ADD] Termite configuration and TERMINAL variable

Switching to Termite because URxvt has weird rendering issues when
resizing the font.

i3-sensible-terminal needs the TERMINAL environment variable to launch
our prefered terminal emulator with the Ctrl+d binding.

Bash and Zsh both need a hook to enable Termite to open another terminal
in the same directory with the Ctrl+Maj+t binding.

zsh/.zshrc

@@ -92,3 +92,9 @@ cat /etc/issue
 
 # import my prompt
 source ~/.zsh_prompt
+
+# Export our directory to Termite for opening new terminals
+if [[ $TERM == xterm-termite ]]; then
+  . /etc/profile.d/vte.sh
+  __vte_osc7
+fi