docs: Fix Docker volume mount path for .openhands

[cbagwell]

The default location that OpenHands looks for .openhands directory has moved in recent versions but the docs were not completely updated.

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

The container can either mount at /root/.openhands or set an env var to tell location. I went with /root to match an existing document update that shows running openhands-cli inside a docker container and also mounts at /root.

I have seen some reports in Github Issues and Slack of users confused why conversations are no longer lasting past a container restart and other confusion on behavior differences in $HOME/.openhands after upgrading.

[enyst]

Thank you for the PR, @cbagwell ! It seems this wasn’t working indeed, but the docs had old images:

• Fix docker command startup #289

I’m not sure the openhands dir change may be necessary, WDYT?

[cbagwell]

The -v ~/.openhands:/root/.openhands part is still needed on top of that other much needed fix. Should be easy enough to confirm since you won't see conversations added to ~/.openhands with current docs.

I will rebase this PR's on top of latest docs in just a bit to make merge easier. #289 + this -v fix is actually what I'm currently using daily.

I am confused a bit on how my PR only has the 1 change. I thought I read latest docs on web and saw that it had the image name and tags finally fixed and so I made just the 1 line change; otherwise my intent was to submit PR to fix the image name + tag as well. But that doesn't really make sense based on dates on this PR and #289. So obviously my work needs triple checking. 😄

[enyst]

cc: @mamoodi WDYT?

[cbagwell]

This is location that is now looking at ~/.openhands; which is /root/.openhands by default.

https://github.com/OpenHands/OpenHands/blob/main/openhands/app_server/config.py#L68

I know prior to upgrading to v1 that /.openhands was the correct mount location but I am not familiar with that older code base to know how or why it changed.