add new posts

 Changes to be committed:
	modified:   .gitignore
	new file:   source/_posts/bookmarklets.md
	new file:   source/_posts/debian-ubuntu-stuffs.md
	new file:   source/_posts/fish-shell.md
	new file:   source/_posts/learn-to-code.md
	new file:   source/_posts/oh-my-zsh.md
	new file:   source/_posts/shell-notes.md