docs: update join slack link to ask ai widget (#4218)

## Changes Made

add utm'd join slack link to ask ai widget

## Related Issues

n/a

## Checklist

- [ ] Documented in API Docs (if applicable)
- [ ] Documented in User Guide (if applicable)
- [ ] If adding a new documentation page, doc is added to
`docs/mkdocs.yml` navigation
- [ ] Documentation builds and is formatted properly (tag @/ccmao1130
for docs review)

Author: ccmao1130

docs/js/custom.js

@@ -44,13 +44,13 @@ document.addEventListener("DOMContentLoaded", function () {
   script.setAttribute("version", "stable");
   script.setAttribute("runllm-keyboard-shortcut", "Mod+j"); // cmd-j or ctrl-j to open the widget.
   script.setAttribute("runllm-name", "Daft");
-  script.setAttribute("runllm-position-x", "28px");
+  script.setAttribute("runllm-position-x", "20px");
   script.setAttribute("runllm-position-y", "98px");
   script.setAttribute("runllm-assistant-id", "160");
   script.setAttribute("runllm-preset", "mkdocs");
   script.setAttribute("runllm-theme-color", "#7862ff");
   script.setAttribute("runllm-join-community-text", "Join Daft Slack!");
-  script.setAttribute("runllm-community-url", "https://join.slack.com/t/dist-data/shared_invite/zt-2e77olvxw-uyZcPPV1SRchhi8ah6ZCtg");
+  script.setAttribute("runllm-community-url", "https://www.getdaft.io/slack.html?utm_source=docs&utm_medium=button&utm_campaign=docs_ask_ai");
   script.setAttribute("runllm-community-type", "slack");
 
   script.async = true;