Revert to root level package structure for stow

- Document xstow usage for systems lacking GNU Stow
- Add SPDX headers to .stowrc for license compliance
- Add REUSE specification compliance notes to README

vim/.vimrc

@@ -0,0 +1,20 @@
+" SPDX-FileCopyrightText: 2019, 2022 Kris Lamoureux <kris@lamoureux.io>
+" SPDX-License-Identifier: 0BSD
+
+syntax enable
+colorscheme monokai
+set number
+
+set tabstop=2
+set shiftwidth=2
+set expandtab
+
+set colorcolumn=80
+
+if &term =~ '256color'
+  " disable Background Color Erase (BCE) so that color schemes
+  " render properly when inside 256-color tmux and GNU screen.
+  " see also http://snk.tuxfamily.org/log/vim-256color-bce.html
+  set t_ut=
+endif
+