Add s3 integration

Doing so has a number of benefits
- Overcome the 10Mb limit of the API gateway the lambdas have to go
through
- By storing the key as the hash of the code we can return previous
generated assets, i.e. caching
- cost, transfering assets into the bucket within the AWS ecosystem
is faster than return, and there fore the lambdas execute for less time
- Sets us up for the future as when generating artifacts for repos when
there is a change to master etc we want to store these assets somewhere
and s3 is an obvious choice
- Solved a weird CORS issue where I couldn't get CORS working with
binaryMediaTypes enabled, don't need binary types when dumping in s3

Resolves #316

app/web/src/helpers/hooks/useIdeState.js

@@ -33,8 +33,6 @@ result = (cq.Workplane().circle(diam).extrude(20.0)
           .faces("<Z").workplane(invert=True).circle(0.8).cutBlind(12.0)
           .edges("%CIRCLE").chamfer(0.15))
 
-# exporters.export(coupler, "/home/jwright/Downloads/coupler.stl", exporters.ExportTypes.STL)
-
 show_object(result)
 `,
 }