Replace dub.sh/openhands links with all-hands.dev/joinslack (#11209)

Co-authored-by: openhands <openhands@all-hands.dev>

.github/workflows/welcome-good-first-issue.yml

@@ -45,7 +45,7 @@ jobs:
                     "This issue has been labeled as **good first issue**, which means it's a great place to get started with the OpenHands project.\n\n" +
                     "If you're interested in working on it, feel free to! No need to ask for permission.\n\n" +
                     "Be sure to check out our [development setup guide](" + repoUrl + "/blob/main/Development.md) to get your environment set up, and follow our [contribution guidelines](" + repoUrl + "/blob/main/CONTRIBUTING.md) when you're ready to submit a fix.\n\n" +
-                    "Feel free to join our developer community on [Slack](dub.sh/openhands). You can ask for [help](https://openhands-ai.slack.com/archives/C078L0FUGUX), [feedback](https://openhands-ai.slack.com/archives/C086ARSNMGA), and even ask for a [PR review](https://openhands-ai.slack.com/archives/C08D8FJ5771).\n\n" +
+                    "Feel free to join our developer community on [Slack](https://all-hands.dev/joinslack). You can ask for [help](https://openhands-ai.slack.com/archives/C078L0FUGUX), [feedback](https://openhands-ai.slack.com/archives/C086ARSNMGA), and even ask for a [PR review](https://openhands-ai.slack.com/archives/C08D8FJ5771).\n\n" +
                     "🙌 Happy hacking! 🙌\n\n" +
                     "<!-- auto-comment:good-first-issue -->"
             });

README.md

@@ -11,7 +11,7 @@
   <a href="https://github.com/All-Hands-AI/OpenHands/stargazers"><img src="https://img.shields.io/github/stars/All-Hands-AI/OpenHands?style=for-the-badge&color=blue" alt="Stargazers"></a>
   <a href="https://github.com/All-Hands-AI/OpenHands/blob/main/LICENSE"><img src="https://img.shields.io/github/license/All-Hands-AI/OpenHands?style=for-the-badge&color=blue" alt="MIT License"></a>
   <br/>
-  <a href="https://dub.sh/openhands"><img src="https://img.shields.io/badge/Slack-Join%20Us-red?logo=slack&logoColor=white&style=for-the-badge" alt="Join our Slack community"></a>
+  <a href="https://all-hands.dev/joinslack"><img src="https://img.shields.io/badge/Slack-Join%20Us-red?logo=slack&logoColor=white&style=for-the-badge" alt="Join our Slack community"></a>
   <a href="https://github.com/All-Hands-AI/OpenHands/blob/main/CREDITS.md"><img src="https://img.shields.io/badge/Project-Credits-blue?style=for-the-badge&color=FFE165&logo=github&logoColor=white" alt="Credits"></a>
   <br/>
   <a href="https://docs.all-hands.dev/usage/getting-started"><img src="https://img.shields.io/badge/Documentation-000?logo=googledocs&logoColor=FFE165&style=for-the-badge" alt="Check out the documentation"></a>
@@ -139,7 +139,7 @@ troubleshooting resources, and advanced configuration options.
 OpenHands is a community-driven project, and we welcome contributions from everyone. We do most of our communication
 through Slack, so this is the best place to start, but we also are happy to have you contact us on Github:
 
-- [Join our Slack workspace](https://dub.sh/openhands) - Here we talk about research, architecture, and future development.
+- [Join our Slack workspace](https://all-hands.dev/joinslack) - Here we talk about research, architecture, and future development.
 - [Read or post Github Issues](https://github.com/All-Hands-AI/OpenHands/issues) - Check out the issues we're working on, or add your own ideas.
 
 See more about the community in [COMMUNITY.md](./COMMUNITY.md) or find details on contributing in [CONTRIBUTING.md](./CONTRIBUTING.md).

docs/docs.json

@@ -214,7 +214,7 @@
   },
   "footer": {
     "socials": {
-      "slack": "https://dub.sh/openhands",
+      "slack": "https://all-hands.dev/joinslack",
       "github": "https://github.com/All-Hands-AI/OpenHands",
       "discord": "https://discord.gg/ESHStjSjD4"
     }