Remove some stale directories from PATH

There should be some better way of getting the current path. The problem
is that emacs is started not from my login shell but some other, which
is why I need to set my env like this.
Remove old windmove.el which is now part of emacs

Also add keybindings that kinda match vi for moving between panes. Using
just `C-[hjkl]` will mess with other commands so they're prefixed with
`C-. [hjkl]`, but still good enough.
Add some keyboard shortcuts for ag mode