Remove broken link references to bug bounty program (#19779)

The link https://app.intigriti.com/programs/mastodon/mastodonio/detail no longer works

* Closes #19491

Signed-off-by: Yarden Shoham <hrsi88@gmail.com>

Signed-off-by: Yarden Shoham <hrsi88@gmail.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,4 @@ blank_issues_enabled: false
 contact_links:
   - name: GitHub Discussions
     url: https://github.com/mastodon/mastodon/discussions
-    about: Please ask and answer questions here.
+    about: Please ask and answer questions here.
-  - name: Bug Bounty Program
-    url: https://app.intigriti.com/programs/mastodon/mastodonio/detail
-    about: Please report security vulnerabilities here.

SECURITY.md

@@ -1,6 +1,6 @@
 # Security Policy
 
-If you believe you've identified a security vulnerability in Mastodon (a bug that allows something to happen that shouldn't be possible), you should submit the report through our [Bug Bounty Program][bug-bounty]. Alternatively, you can reach us at <hello@joinmastodon.org>.
+If you believe you've identified a security vulnerability in Mastodon (a bug that allows something to happen that shouldn't be possible), you can reach us at <hello@joinmastodon.org>.
 
 You should *not* report such issues on GitHub or in other public spaces to give us time to publish a fix for the issue without exposing Mastodon's users to increased risk.
 
@@ -16,5 +16,3 @@ A "vulnerability in Mastodon" is a vulnerability in the code distributed through
 | 3.4.x   | Yes                |
 | 3.3.x   | No                 |
 | < 3.3   | No                 |
-
-[bug-bounty]: https://app.intigriti.com/programs/mastodon/mastodonio/detail