Disable CtrlPLine extension.

I don't find it very useful.  What I want is something that powerful for
searching through all files in the project directory.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Remove nerdtree.

I don't use it.  I don't agree with the idea of file explorer in Vim.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>