Move all docs to 'docs/' dir

docs/automatic_start.md

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+# Automatic Tmux start
+
+Tmux is automatically started after the computer/server is turned on.
+
+### OS X
+
+To enable this feature:
+- put `set -g @continuum-boot 'on'` in `tmux.conf`
+- reload tmux config with this shell command: `$ tmux source-file ~/.tmux.conf`
+
+Next time the computer is started:
+- `Terminal.app` window will open and resize to maximum size
+- `tmux` command will be executed in the terminal window
+- if "auto restore" feature is enabled, tmux will start restoring previous env
+
+Config options:
+- `set -g @continuum-boot-options 'fullscreen'` - terminal window
+  will go fullscreen
+- `set -g @continuum-boot-options 'iterm'` - start `iTerm` instead
+  of `Terminal.app`
+- `set -g @continuum-boot-options 'iterm,fullscreen'` - start `iTerm`
+  in fullscreen
+
+### Linux
+
+Help with this would be greatly appreciated. Please get in touch.