Add a push API to accept normalized json files

When the line length is too long the general style/solution is
```python
app = Flask(__name__,
            static='website/static/', static_url_path='/static')
```
Or
```python
app = Flask(
    __name__,
    static='website/static/',
    static_url_path='/static'
)
```

I guess the latter would be prefered here.