Update README.md

[alecchendev]

Now that gitbook docs are launched, we can change readme to more of a basic overview and contribution guidelines

• still keep basic description
• links to website, twitter, docs
• how to build and deploy program
• overview of scripts and how to run
• running our website - look in head tag for a helpful comment, also its literally an html file lmao
• contributing - basically our engineering flow: assign yourself an issue, create new branch, dummy commit, draft PR, make changes, change PR to be ready for review, request review, iterate, merge
• Also add a part on why we went with raw solana and not anchor - mainly we wanted to build and hadn't learned anchor yet but we had alr gotten started with raw SOL for fundamentals/intuition