docs: update broken Slack invite links to support page (#16546)

Replace broken Slack links (litellmossslack.slack.com and expired invite URLs)
with the correct support page URL (https://www.litellm.ai/support) across all
documentation files.

Files updated:
- CONTRIBUTING.md
- docs/my-website/docs/contact.md
- docs/my-website/docs/proxy/docker_quick_start.md
- docs/my-website/docs/troubleshoot.md
- docs/my-website/src/pages/contact.md

CONTRIBUTING.md

@@ -258,7 +258,7 @@ docker run \
 If you need help:
 
 - 💬 [Join our Discord](https://discord.gg/wuPM9dRgDw)
-- 💬 [Join our Slack](https://join.slack.com/share/enQtOTE0ODczMzk2Nzk4NC01YjUxNjY2YjBlYTFmNDRiZTM3NDFiYTM3MzVkODFiMDVjOGRjMmNmZTZkZTMzOWQzZGQyZWIwYjQ0MWExYmE3)
+- 💬 [Join our Slack](https://www.litellm.ai/support)
 - 📧 Email us: ishaan@berri.ai / krrish@berri.ai
 - 🐛 [Create an issue](https://github.com/BerriAI/litellm/issues/new)
 

docs/my-website/docs/contact.md

@@ -2,6 +2,6 @@
 
 [![](https://dcbadge.vercel.app/api/server/wuPM9dRgDw)](https://discord.gg/wuPM9dRgDw)
 
-* [Community Slack 💭](https://join.slack.com/share/enQtOTE0ODczMzk2Nzk4NC01YjUxNjY2YjBlYTFmNDRiZTM3NDFiYTM3MzVkODFiMDVjOGRjMmNmZTZkZTMzOWQzZGQyZWIwYjQ0MWExYmE3)
+* [Community Slack 💭](https://www.litellm.ai/support)
 * [Meet with us 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
 * Contact us at ishaan@berri.ai / krrish@berri.ai

docs/my-website/docs/proxy/docker_quick_start.md

@@ -504,7 +504,7 @@ LiteLLM Proxy uses the [LiteLLM Python SDK](https://docs.litellm.ai/docs/routing
 - [Schedule Demo 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
 
 - [Community Discord 💭](https://discord.gg/wuPM9dRgDw)
-- [Community Slack 💭](https://join.slack.com/share/enQtOTE0ODczMzk2Nzk4NC01YjUxNjY2YjBlYTFmNDRiZTM3NDFiYTM3MzVkODFiMDVjOGRjMmNmZTZkZTMzOWQzZGQyZWIwYjQ0MWExYmE3)
+- [Community Slack 💭](https://www.litellm.ai/support)
 
 - Our emails ✉️ ishaan@berri.ai / krrish@berri.ai
 

docs/my-website/docs/troubleshoot.md

@@ -2,7 +2,7 @@
 [Schedule Demo 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
 
 [Community Discord 💭](https://discord.gg/wuPM9dRgDw)
-[Community Slack 💭](https://litellmossslack.slack.com/)
+[Community Slack 💭](https://www.litellm.ai/support)
 
 Our numbers 📞 +1 (770) 8783-106 / ‭+1 (412) 618-6238‬
 

docs/my-website/src/pages/contact.md

@@ -4,5 +4,5 @@
 
 
 * [Meet with us 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
-* [Community Slack 💭](https://join.slack.com/share/enQtOTE0ODczMzk2Nzk4NC01YjUxNjY2YjBlYTFmNDRiZTM3NDFiYTM3MzVkODFiMDVjOGRjMmNmZTZkZTMzOWQzZGQyZWIwYjQ0MWExYmE3)
+* [Community Slack 💭](https://www.litellm.ai/support)
 * Contact us at ishaan@berri.ai / krrish@berri.ai