Add dev container docs

[jmcphers]

Adds basic documentation for the Dev Containers feature.

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[juliasilge]

Can you try running the new Claude doc-reviewer skill on this PR?
https://github.com/posit-dev/doc-reviewer/

It should help you with alt text for images, using bold aligned with the style guide, etc. One thing I want to note is that commands should be italics, and pretty much the only things that should be bold are UI elements, like where you have "Dev Containers".

[juliasilge]

You might get pretty far by asking Claude to use the CLAUDE.md in this repo too.

[jmcphers]

@juliasilge done!

[juliasilge]

Thank you!

I apologize so much for not being clear enough before, but the images do need alt text and not captions:
https://github.com/posit-dev/doc-reviewer/blob/main/skills/doc-reviewer/posit-style-guide.md

To get more explicit, that is like this:

![Action Bars](images/action-bars.png){fig-alt="Positron IDE showing action bars in various panes including the Editor, Console, Variables pane, and Plots pane."}

The captions are typically shorter and meant for any reader, while the alt text is longer and meant for folks with vision differences.

Did the skill or the prompting not correctly identify that it's alt text we need? Maybe we can be more strong about that somewhere.

[jmcphers]

Did the skill or the prompting not correctly identify that it's alt text we need? Maybe we can be more strong about that somewhere.

Yeah, the skill (I used doc-reviewer) guided me to make the caption into a full sentence and didn't prompt me to add alt text at all. Probably could use an update!

[juliasilge]

Thank you! 🐳