Fix issue #59 - Update contributing.md doc (#63)

* Update links, folder names, and app names from vscode to pearai-app

* Update links for the README files and dev containers

* Further changes to VSCode references

* Make requests changes and fix minor grammar

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Co-authored-by: Duke Pan <[email protected]>
Co-authored-by: Nang <[email protected]>

Author: 3 people