Rename OpenDevin to OpenHands

[rbren]

What is the problem that this fixes or functionality that this introduces? Does it fix any open issues?
We are renaming the repo!

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Give a summary of what the PR does, explaining any non-trivial design decisions

Here are the commands I ran (using my custom replaceall util)

replaceall ./ 's/opendevin/openhands/g'
replaceall ./ 's/OpenDevin/OpenHands/g'
replaceall ./ 's/open devin/OpenHands/g'
replaceall ./ 's/github.com\/OpenHands/github.com\/All-Hands-AI/g'
replaceall ./ 's/OpenHands\/OpenHands/All-Hands-AI\/OpenHands/g'
replaceall ./ 's/openhands\/openhands/All-Hands-AI\/OpenHands/g'
replaceall ./ 's/cd OpenHands/cd openhands/g'
replaceall 's/ghcr.io\/All-Hands-AI\/OpenHands/ghcr.io\/all-hands-ai\/openhands'
replaceall ./ 's/ghcr.io\/All-Hands-AI\/OpenHands/ghcr.io\/all-hands-ai\/openhands'
replaceall ./ 's/ghcr.io\/All-Hands-AI\/OpenHands/ghcr.io\/all-hands-ai\/openhands/g'
replaceall ./ 's/DOCKER_ORG=openhands/DOCKER_ORG=all-hands-ai/g'
replaceall ./ 's/organizationName: "Open Hands"/organizationName: "All-Hands-AI"/g'
replaceall ./ 's/organizationName: "OpenHands"/organizationName: "All-Hands-AI"/g'
replaceall ./ 's/OPENDEVIN/OPENHANDS/g'
replaceall ./ 's/open-devin/openhands/g'
replaceall ./ 's/devin/openhands/g'
replaceall ./ 's/DEVIN/OPENHANDS/g'
replaceall ./ 's/OPEN_OPENHANDS/OPENHANDS/g'

# Revert image references in documentation for now
replaceall README.md 's/ghcr.io\/all-hands-ai\/openhands/ghcr.io\/opendevin\/opendevin/g'
replaceall docs/ 's/ghcr.io\/all-hands-ai\/openhands/ghcr.io\/opendevin\/opendevin/g'

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Other references

[neubig]

This is basically a global search and replace. My suggestion would be that we get this in, and then make any additional fixes on top of this.