Remove document about sourcing flow

The deleted document is available at:
3ce7436314

README.md

@@ -27,76 +27,6 @@ bash prompt.
 
 
 
-shrc.common
------------
-
-`setup.sh` will create file "$HOME/.shrc.common". This file define some
-variables that can be used to detect system type. This file is sourced from
-both `setup.sh` and `shrc`.
-
-
-
-Sourcing flow
--------------
-
-1. $HOME/.profile
-
-  Sourced if:
-
-  * currnet shell is login shell and
-    * (current shell is sh ||
-    * (current shell is bash && $HOME/.bash_profile does not exist) ||
-    * (current shell is zsh && $HOME/.zprofile does not exist))
-
-  This file set ENV to $HOME/.shrc , which is loaded when sh is run interactively.
-  Add lines like `test -n "$BASH_VERSION" && . "$HOME/.bashrc"` .
-
-
-
-2. $HOME/{.bash_profile,.zprofile}
-
-  Sourced if current shell is login shell and shell is bash or zsh.
-  Srouce $HOME/.profile .
-
-
-3. $HOME/.shrc
-
-  Sourced through ENV when shell is sh, and $HOME/.{ba,z}shrc if bash or zsh
-  respectively. Source $HOME/.dotfiles/shrc .
-
-
-4. $HOME/.{ba,z}shrc
-
-  Sourced when current shell is bash or zsh respectively and current shell is not
-  login shell. When current shell is login shell, these files are sourced
-  explicitly by $HOME/.profile . Source $HOME/.shrc .
-
-
-```
-$HOME/{.bash_profile,.zprofile}  <= login with bash/zsh
-|
-`--$HOME/.profile                <= login with sh
-   |  |
-   |  `--$HOME/.dotfiles/profile
-   |
-   |  $HOME/.{ba,z}shrc          <= bash, zsh
-   |  |
-   `--`--$HOME/.shrc             <= sh (by EnvVal ENV)
-         |
-         `--$HOME/.dotfiles/shrc
-```
-
-```
-~/.xinitrc                <= startx
-|
-`--openbox-session
-   |
-   |--~/.dotfiles/xprofile
-   |
-   `--~/.dotfiles/xprograms
-```
-
-
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