add devcontainer setup docs

[tangowithfoxtrot]

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Objective

This adds documentation for VS Code Dev Containers, added by the associated PR in server.

[bitwarden-bot]

Checkmarx One – Scan Summary & Details – 5035d625-d5c4-4950-9182-d115a710098d

No New Or Fixed Issues Found

[tangowithfoxtrot]

I am not sure why the build workflow is having issues with the link used in the docs; the link works locally and is a direct copy from the standard "Setup Guide" steps.

[cloudflare-workers-and-pages[bot]]

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[withinfocus]

@tangowithfoxtrot my other comment may have been missed -- link errors are blocking the build.

[tangowithfoxtrot]

@withinfocus My bad. I did miss your comment there. I can look into an alternative link format, but I'm confused as to why the build workflow would claim that it's broken, as it's a direct copy from the existing "Setup Guide" doc ~~and works with my local build.~~

[tangowithfoxtrot]

~as it's a direct copy from the existing "Setup Guide" doc and works with my local build.~

Whoops. That was incorrect 😁 Looking into it now...

[withinfocus]

With https://github.com/bitwarden/server/pull/3080 landed should we look at this again?