Add `snippets`, dircolors, Sphinx functions.

Add:
	vim/
		snippets(/(python, c).vim)
			-Add dir for vim snippets
			-Add `python` and `c` snippets files.

		ftplugin/python.vim
			-Add `Sphinx` documentation generator functions.
			-Remove python abbreviations.

	vimrc
		-Add `VisualIndent()` and `VisualDeindent()`, to preserve block
		selection across indentation.
Add ssh entries, zsh git functions.

Add:
	zshrc
		-Move function header comments into the function definition bodies,
		emulating Python docstring style.
		-Add `gdba()` to delete branches both remotely and locally;
		add `gl()` to print well-formatted `git log` output.