organized and removed redundant installations

- organized installation in to sections
- removed redundant installation (`mongod` installation ran twice before this update [here](https://github.com/silverbux/ubuntu-deven-bootstrap/blob/master/ubuntu-bootstrap.sh#L14) and [here](https://github.com/silverbux/ubuntu-deven-bootstrap/blob/master/ubuntu-bootstrap.sh#L55))
- added `vim-nox`
- added `.vimrc` and vim directories for backup, swaps, colors etc
- switched from `~` to `$HOME`