Add download links

.gitignore

Dockerfile

entrypoint.sh

src/app/app.py

src/app/static/css/app.css

src/app/static/css/bootstrap.min.css

src/app/static/js/app.js

src/app/static/package-lock.json

src/app/static/package.json

src/app/templates/base.html

src/app/templates/unl2rdf.html