Update Cloud Environment Setup - policies & usage costs

[jules32]

Idea to add subsections to Cloud Environmental Setup:

https://nasa-openscapes.github.io/earthdata-cloud-cookbook/environment-setup/.

To include/consider:

• Page for costs, based on examples with screenshots
• Page for 2i2c, corn
• Page for Coiled

Resources to include:

• https://github.com/NASA-Openscapes/2i2cAccessPolicies
• How to Add Folks to 2i2c GitHub Teams - evolving, maybe link as published/read-only google doc?

[alexishunzinger]

See #284 where Amy is looking to beef up the Environment Setup section with material from the Cloud Playground's Offboarding section