Update the docs with recent changes

[Sealjay]

• Update the structure file - https://github.com/Avanade/emtech-stretch-labs/blob/main/docs/structure.md
• Update the local testing file - https://github.com/Avanade/emtech-stretch-labs/blob/main/docs/local-testing.MD
• Update the stretch docs - https://github.com/Avanade/emtech-stretch-labs/blob/main/docs/stretch-docs.md
• Update the Rocos set up - https://github.com/Avanade/emtech-stretch-labs/blob/main/docs/rocos-setup.MD