bashrc: Fix bash-completion by sourcing system /etc/profile

On Fedora, /etc/profile sets up the magic that tells bash to include the
bash_completion files.
bashrc: Set colors in PS1

Try to autodetect light/dark background with kw_ps1_auto().
git: Update email -> chad@kiwitree.net
stowignore: Ignore files from git, make, and readmes
make: Simplify Makefile, rely on `stow` for symlinking

`make install` now just makes a symlink from $(DESTDIR)$(home) to the
source dir.
Move everything into ~/.local

I want a clean, uncluttered home directory.
bash/kiwi/git: Add module

Defines functions
  git-cd-git-dir
  git-cd-work-tree
redshift: Add default.conf -> portland.conf
find-broken-symlinks: Add script
youtube-dl: Add config file
waffle: Remove submodule
gnome-shell-extension-sensors: Remove submodule
make: Rework DESTDIR/prefix vars

Let prefix=$HOME.
Move ~/.local/* -> ~/

Keeping everything in ~/.local made me claustrophobic.