JSON data endpoints

[tsumaru720]

Havent properly decided how/what I want to do yet, but for the purposes of getting a proof-of-concept the current pages use PHP/Twig to write inline javascript for rendering graphs. 🤢

Ideally I want this to be something I can just hit and pull json from to populate the graphs. This would ultimately allow me a lot more flexibility with how the graphs work.

I think the simplest initial revision would be a basic API of sorts that would have a number of "views" defined - each view representing the data required to display one graph. The only issue with this method is 1 page view with say 30 graphs would result in 30 additional hits to the "graph api" which might hamper performance/usability a bit.

Will need some additional testing

Happy to take discussion/suggestions on this

[tsumaru720]

Whilst i could bodge it in - this is a blocker for #22