Updated the stale issue / PR workflow to include better verbiage for …

…the contribution guide.

Also updated the stale issue / PR workflow to exclude security vulnerabilities.

.github/workflows/stale.yml

@@ -26,7 +26,7 @@ jobs:
             This PR has been automatically closed due to lack of activity.
           days-before-stale: 90
           days-before-close: 30
-          exempt-issue-labels: 'mod / announcement, mod / accepted, mod / reviewing, mod / testing'
+          exempt-issue-labels: 'bug / security-vulnerability, mod / announcement, mod / accepted, mod / reviewing, mod / testing'
           operations-per-run: 100
           remove-stale-when-updated: false
           stale-issue-label: 'mod / stale'
@@ -37,7 +37,7 @@ jobs:
             issues may receive direct feedback. **Do not** attempt to circumvent this
             process by "bumping" the issue; doing so will result in its immediate closure
             and you may be barred from participating in any future discussions. Please see
-            our [contributing guide](https://github.com/PowerDNS-Admin/PowerDNS-Admin/blob/master/docs/CONTRIBUTING.md).
+            our [Contribution Guide](https://github.com/PowerDNS-Admin/PowerDNS-Admin/blob/master/docs/CONTRIBUTING.md).
           stale-pr-label: 'mod / stale'
           stale-pr-message: >
             This PR has been automatically marked as stale because it has not had