Update Slack invite links (#1893)

Author: mootari

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Observable Plot - Contributing
 
-Observable Plot is open source and released under the [ISC license](./LICENSE). You are welcome to [send us pull requests](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests) to contribute bug fixes or new features. We also invite you to participate in [issues](https://github.com/observablehq/plot/issues) and [discussions](https://github.com/observablehq/plot/discussions). We use issues to track and diagnose bugs, as well as to debate and design enhancements to Plot. Discussions are intended for you to ask for help using Plot, or to share something cool you’ve built with Plot. You can also ask for help on the [Observable Forum](https://talk.observablehq.com) and the [Observable community Slack](https://join.slack.com/t/observable-community/shared_invite/zt-1x7gs4fck-UHhEFxUXKHVE8Qt3XmJCig).
+Observable Plot is open source and released under the [ISC license](./LICENSE). You are welcome to [send us pull requests](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests) to contribute bug fixes or new features. We also invite you to participate in [issues](https://github.com/observablehq/plot/issues) and [discussions](https://github.com/observablehq/plot/discussions). We use issues to track and diagnose bugs, as well as to debate and design enhancements to Plot. Discussions are intended for you to ask for help using Plot, or to share something cool you’ve built with Plot. You can also ask for help on the [Observable Forum](https://talk.observablehq.com) and the [Observable community Slack](https://observablehq.com/slack/join).
 
 We request that you abide by our [code of conduct](https://observablehq.com/@observablehq/code-of-conduct) when contributing and participating in discussions.
 

docs/.vitepress/config.ts

@@ -144,7 +144,7 @@ export default defineConfig({
       {icon: "github", link: "https://github.com/observablehq/plot"},
       {icon: "twitter", link: "https://twitter.com/observablehq"},
       {icon: "mastodon", link: "https://vis.social/@observablehq"},
-      {icon: "slack", link: "https://join.slack.com/t/observable-community/shared_invite/zt-1x7gs4fck-UHhEFxUXKHVE8Qt3XmJCig"},
+      {icon: "slack", link: "https://observablehq.com/slack/join"},
       {icon: "linkedin", link: "https://www.linkedin.com/company/observable"},
       {icon: "youtube", link: "https://www.youtube.com/c/Observablehq"}
     ],

docs/.vitepress/theme/CustomFooter.vue

@@ -14,7 +14,7 @@
           <div class="mb2 fw6 f14">Resources</div>
           <ul>
             <li class="mb2"><a target="_blank" href="https://talk.observablehq.com">Forum</a></li>
-            <li class="mb2"><a target="_blank" href="https://join.slack.com/t/observable-community/shared_invite/zt-1x7gs4fck-UHhEFxUXKHVE8Qt3XmJCig">Slack</a></li>
+            <li class="mb2"><a target="_blank" href="https://observablehq.com/slack/join">Slack</a></li>
             <li class="mb2"><a target="_blank" href="https://github.com/observablehq/plot/releases">Releases</a></li>
             <li class="mb2"><a target="_blank" href="https://observablehq.com/@observablehq/plot-twist-newsletter-signup">Newsletter</a></li>
           </ul>

docs/community.md

@@ -14,7 +14,7 @@ And of course, follow us on [Observable](https://observablehq.com/@observablehq?
 
 ## Getting help
 
-We recommend asking for help on the [Observable forum](https://talk.observablehq.com/c/help/6). Or if you prefer chat, join the [Observable community Slack](https://join.slack.com/t/observable-community/shared_invite/zt-1x7gs4fck-UHhEFxUXKHVE8Qt3XmJCig).
+We recommend asking for help on the [Observable forum](https://talk.observablehq.com/c/help/6). Or if you prefer chat, join the [Observable community Slack](https://observablehq.com/slack/join).
 
 We encourage you to share your work, no matter how messy, on [Observable](https://observablehq.com). Sharing live code is the easiest way to let people see what you see, and to debug your problem. Strive for a [minimal, reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) — it helps people hone in on your problem more quickly.
 
@@ -35,7 +35,7 @@ We’d love for you to join the community! Here are some ways to participate:
 
 * Upvote 👍 or comment on [GitHub issues](https://github.com/observablehq/plot/issues). We’d love your input on what to build next. If your desired feature isn’t already there, or if you’ve found a bug, file an issue and tell us about it.
 
-* Answer questions or participate in discussions on the [Observable forum](https://talk.observablehq.com/) and the [Observable community Slack](https://join.slack.com/t/observable-community/shared_invite/zt-1x7gs4fck-UHhEFxUXKHVE8Qt3XmJCig). You’ll help others, and might learn something yourself, too.
+* Answer questions or participate in discussions on the [Observable forum](https://talk.observablehq.com/) and the [Observable community Slack](https://observablehq.com/slack/join). You’ll help others, and might learn something yourself, too.
 
 * Open a pull request! Read our [guide to contributing](https://github.com/observablehq/plot/blob/main/CONTRIBUTING.md).