Fix some broken links

[mamoodi]

• This change is worth documenting at https://docs.all-hands.dev/
• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

End-user friendly description of the problem this fixes or functionality this introduces.

Fix some broken links

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Summarize what the PR does, explaining any non-trivial design decisions.

Thanks to @llamantino for pointing these out.
The docs are being reviewed one by one so there's decent amount of changes coming in still. Just updating these for now to avoid broken links.

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Link of any specific issues this addresses:

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:4a3d649-nikolaik   --name openhands-app-4a3d649   docker.all-hands.dev/all-hands-ai/openhands:4a3d649