Overhaul the run repo in preparation for PoS launch

[diamondhands0]

This repo will help validators get nodes up and running, and help devs make changes more effectively. Summary of everything I did:

• Upgraded all the variables for Proof of Stake and tested that they work for my own devnet node.
• Added Makefile so we do everything with a simple make {command}
• Cleaned up the environment variables so that all of them are now in a base.env file with good descriptions of what each flag does.
• Created a docker-compose.yml for each environment {local, devnet, testnet, mainnet}. This pulls in everything from base.env and explicilty overrides certain flags that are needed for the environment.
• Added a handy command to wipe the disk of each environment: make {environment}-wipe. The flow is you run a node for an environment using make {environment} and then if you want to try syncing from scratch you do make {environment}-wipe before you run make {environment} again.
• Added a local environment. This one is neat: If you clone a local backend+core in the parent directory and run make local it will run the node using your local code rather than a remote image. This could theoretically replace our reliance on n0_test and that family of scripts. I was using it to play with stuff and found it quite ergonomic, and much saner because the environment variables are cleanly organized and overridden only as needed.
• I also deleted the LICENSE anymore. I can't remember who added that or why but licenses are lame.
• Updated the README, although it could use a little more love. I'm thinking once we get testnet PoS going I can make a video where I use this repo to get a validator going on a brand new cloud machine to show them how everything works step by step.

[carry2web]

Please update the Google doc https://docs.google.com/document/d/e/2PACX-1vTBJidczUhRBhl2hTo_75o8md0RNwFguF_FeUEG_CkooN5dMLBrGyqcXvIu5efE9iAhC8ZqRr_S89Ml/pub that pointed to now merged branch feature/proof-of-stake?