slimmed down docker container

[nexus-uw]

• use intern container to run webpack + ts build and then copy over the build results to final container
• moved some build deps over to devDeps to slim down runtime deps in final container
• added build + dep folders to docker ignore (only matters for building locally, but asserts that only the built files are used in the container)

[nexus-uw]

result

using the temp build container slimmed 755MB -> 233MB and moving a couple of those build deps to devDeps slimmed it down from 233MB -> 169MB

testing

docker run -p 0.0.0.0:3001:3001 ass2 visited instance and was able to create a chat session