docs: issues on the GitHub mirror, with bug and feature forms

The README says pull requests aren't taken and points to issues on the
GitHub mirror. Issue forms for bug reports and feature requests set the
bug and enhancement labels; blank issues are off.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Docs
+    url: https://git.kebcloud.no/keb/lazysecrets/src/branch/main/docs
+    about: Keys, sources, links, config and more.