Create a token updates

[mikemaccana]

We used creating a token to film last week, here's lots of small fixes:

• Grammarly run over everything
• Add 'token' as a keyword, remove 'web3js' (this tutorial doesn't never used web3js)
• Get people to look at and use Explorer more, and add screenshots to show what they can expect.
• Focus on faucet.solana.com for getting SOL per Jacob's recommendation.
• Use a better name than key as the name of the keypair for the mint authority. The other key is also a key! We've picked bos for 'boss'.
• Use a list and alphabetically sort the list of online storage services
• Bundlr is now Irys
• Talk about the image first, then the metadata JSON, since the meatdata JSON must include the image.