Restructure the project layout

sage_validation/theme/static_src/.gitignore

sage_validation/theme/static_src/package-lock.json

sage_validation/theme/static_src/package.json

sage_validation/theme/static_src/postcss.config.js

sage_validation/theme/static_src/src/styles.css

sage_validation/theme/static_src/tailwind.config.js

sage_validation/theme/templates/base.html

sage_validation/urls.py

sage_validation/wsgi.py