Draft: Keep streets-gl alive

[alexandargyurov]

Hello everyone! I've managed to update streets-gl to use the latest data from OSM. I plan to write a full step-by-step guide on how to achieve this and add it in a new DOCS folder in this repo. The process involves cloning https://github.com/StrandedKitty/planetiler, downloading the planet.osm.pbf, and running a very long process to generate the tiles (8 hours on GCP!)

You can access the new build here: https://streets-gl.onrender.com/
(the server is tiny, expect it to be slow, will upgrade it if it needs some more juice)

Next Steps:

• Create DOCS.md explaining how to build map tiles
• Cron Job each week to run a build with new OSM data
• Talk with @StrandedKitty about the current domain, deployment, future plans
• Go through the current open issues and do some feature requests and bug fixing 🐛 🔨

PR Changes:

• Adds dotenv to package.json
• Loads .env variables in webpack.config.js
• Updates src/app/Config.ts to use process.env for TileServerEndpoint and TilesEndpointTemplate