Webpack production build fixes and disabled LAS functionality

[PEKennedy]

• Fixes webpack, adds a .env file, fixes .babelrc, etc. etc. so that a production build can be made
• Adds a .yarnclean to keep the build size small
• merges Connor's work on LAS. Uploading an LAS file is disabled since this isn't functional. Also adds some of my work on some fixes towards LAS.
• Edit: Add script to package.json to make production deployment easy "yarn production" to build and host
• Edit: Change script "yarn serve" to actually serve the build.
• Edit2: Update Readme to have production instructions.

[Conner-H]

production stuff works on my end as well, las stuff is all disabled so not worrying about that, cityquery still runs