chore: replace slack with discord (#9900)

* chore: replace slack with discord

* fix: add slack again to avoid braking code

* chore: update readme.md

* chore: update 404

* Update packages/lib/constants.ts

* chore: add discord svg and update 404

* chore: delete svg and shift to code

---------

Co-authored-by: Peer Richelsen <peeroke@gmail.com>
Co-authored-by: Peer Richelsen <peer@cal.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Questions
-    url: https://cal.com/slack
-    about: Ask a general question about the project on our Slack workspace
+    url: https://go.cal.com/discord
+    about: Ask a general question about the project on our discord community

.github/workflows/welcome-new-contributors.yml

@@ -23,6 +23,6 @@ jobs:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           pr-message: |-
             Thank you for making your first Pull Request and taking the time to improve Cal.com ! ❤️🎉
-            Feel free to join the conversation at [slack](https://calendso.slack.com/)
+            Feel free to join the conversation at [discord](https://go.cal.com/discord)
           issue-message: | 
             Thank you for opening your first issue, one of our team members will review it as soon as it possible. ❤️🎉