Update New Slack (#230)

* Update README.md

added better community link

* Update CONTRIBUTING.md

added better community link

* Update index.rst

added better community link

Author: jeanniefinks

CONTRIBUTING.md

@@ -77,7 +77,7 @@ For documentation edits, include:
 
 ## Question or Problem
 
-Sign up or log in: **Deep Sparse Community** [Discourse Forum](https://https://discuss.neuralmagic.com/) and/or [Slack](https://discuss-neuralmagic.slack.com/). We are growing the community member by member and happy to see you there. Post all other questions including support or how to contribute. Don’t forget to search through existing discussions to avoid duplication! Thanks!
+Sign up or log in: **Deep Sparse Community** [Discourse Forum](https://https://discuss.neuralmagic.com/) and/or [Slack](https://join.slack.com/t/discuss-neuralmagic/shared_invite/zt-q1a1cnvo-YBoICSIw3L1dmQpjBeDurQ). We are growing the community member by member and happy to see you there. Post all other questions including support or how to contribute. Don’t forget to search through existing discussions to avoid duplication! Thanks!
 
 ## Developing SparseML
 

README.md

@@ -371,7 +371,7 @@ We appreciate contributions to the code, examples, integrations, and documentati
 
 ## Join the Community
 
-For user help or questions about Sparsify, sign up or log in: **Deep Sparse Community** [Discourse Forum](https://discuss.neuralmagic.com/) and/or [Slack](https://discuss-neuralmagic.slack.com/). We are growing the community member by member and happy to see you there.
+For user help or questions about Sparsify, sign up or log in: **Deep Sparse Community** [Discourse Forum](https://discuss.neuralmagic.com/) and/or [Slack](https://join.slack.com/t/discuss-neuralmagic/shared_invite/zt-q1a1cnvo-YBoICSIw3L1dmQpjBeDurQ). We are growing the community member by member and happy to see you there.
 
 You can get the latest news, webinar and event invites, research papers, and other ML Performance tidbits by [subscribing](https://neuralmagic.com/subscribe/) to the Neural Magic community.
 

docs/index.rst

@@ -116,5 +116,5 @@ Additionally, more information can be found via
 
     Bugs, Feature Requests <https://github.com/neuralmagic/sparseml/issues>
     Support, General Q&A Forums <https://discuss.neuralmagic.com/>
-    Deep Sparse Slack Community <https://discuss-neuralmagic.slack.com/>
+    Deep Sparse Community Slack <https://join.slack.com/t/discuss-neuralmagic/shared_invite/zt-q1a1cnvo-YBoICSIw3L1dmQpjBeDurQ>
     Neural Magic Docs <https://docs.neuralmagic.com>