[feature request] investigate using codapi

[hexylena]

the UX is pretty decent (ignore the not actually fibbonaci function, it's just an example) but by adding a <codapi-snippet/> block after ever pre we can get runnable code.

This would work nicely for python and SQL tutorials potentially.

```python                                                                              
def fib(n):                                                                            
    if n < 2:                                                                          
        return 1                                                                       
    else:                                                                              
        return n + fib(n - 1)                                                          
                                                                                       
print(fib(10))                                                                         
```                                                                                    
                                                                                       
<codapi-snippet engine="wasi" sandbox="python" editor="basic"></codapi-snippet>        

produces

with the benefit that it's directly in-page editable. we'd need to see about sharing state between the different boxes.

it's an idea. the jupylite experience kinda sucks, and this'd be better by far.