Use versioned subresource URLs with far-future max-age

[dfabulich]

Due to #176, the runtime size of https://iplayif.com/?story=https%3A%2F%2Fifarchive.org%2Fif-archive%2Fgames%2Fzcode%2FLostPig.z8 has increased considerably, so it's more important that we get the caching rules exactly right, like in iftechfoundation/ifarchive-unbox#68

The page loads subresources like https://iplayif.com/dist/web/bocfel.wasm with an unversioned URL, and it's set to Cache-Control: max-age=600, five minutes.

Instead, we should refer to subresources as bocfel.wasm?lastmod=#### and they should return a far-future max-age=31536000, one year

• jquery.min.js
• web.js
• web.css
• iosevka-extended.woff2
• iosevka-extendedbold.woff2
• bocfel.js
• bocfel.wasm

[curiousdannii]

I'm on board with this. For the files in dist/ I'm currently just telling nginx to proxy them to the Github CDN. It would be great if I can detect the lastmod query within nginx and set the max-age, but if necessary we could shift it to the Node app instead.