Add metadata to index.html (#734)
Add metadata to index.html (#734)

* make tags self-closing

* add preliminary metadata

* undo self-closingness

yunity/karrot-frontend,yunity/foodsaving-frontend,yunity/foodsaving-frontend,yunity/foodsaving-frontend,yunity/karrot-frontend,yunity/karrot-frontend,yunity/foodsaving-frontend,yunity/karrot-frontend