move nnn configuration to its own file, fixes

nnn/.config/.nnn.env

@@ -0,0 +1,5 @@
+export NNN_OPTS='ds'
+export NNN_COLORS='1235'
+export NNN_TRASH=1
+export NNN_FCOLORS='c1e2272e006033f7c6d6abc4'
+export NNN_PLUG='s:start_shell'

nnn/.config/nnn/plugins/start_shell

@@ -0,0 +1,7 @@
+#!/bin/zsh
+
+# Description: Start an interactive zsh shell.
+
+export nnn="$1"
+
+zsh -i