Feature Request: JSON API

**Is your feature request related to a problem? Please describe.**
It would be cool if there was a json api for each card.

**Describe the solution you'd like**
For example `/api/json?username=nthnchu` would return:
```json
{
"name": "Nathan Chu",
"stars": 2,
"commits_this_year": 561,
"pull_requests": 18,
"issues": 52,
"contributed_to": 15,
"grade": "A+"
}
```
Yes, I know I could just fetch from the API, but this would simplify things if I wanted to include it on my site, but in a different layout.

**Describe alternatives you've considered**
Using the GH api

**Additional context**
N/A