add devcontainer config for codespaces #2248
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Description
Added .devcontainer a default & minimal configuration to support running the sndev environment in codespaces, added instructions in the README and modified login link so the hyperlink in the terminal can redirect to the correct container host link. Services are accessible via links in the VSCode tabs
closes #2209
Screenshots
Log in link

Logged in user

Codespaces config

Ports Tab with links

Lnbits

Additional Context
The machines available for Github codespaces have limited compute & storage. Storage left after build & config is less than 10 GB. I customised the devcontainers to run using the highest available free tier machines.
Checklist
Are your changes backward compatible? Please answer below:
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Did you introduce any new environment variables? If so, call them out explicitly here: