Update naming convention to use Web instead of Js

[milesfrain]

We currently use the Js suffix to indicate the recipe is framework-free and runs in the browser, but not on node.js. Since node is also "JS", let's use a less confusing suffix, such as Web.

Also, we should rename BigIntJs to BigInt, since it works on node too.

[JordanMartinez]

I agree with this change.