fix: Move some docs to developers, add deep tech dive section

mkdocs.yml

@@ -67,21 +67,26 @@ nav:
   - Home: index.md
   - About: about.md
   - For Developers:
+      - Contributing: developers/contributing.md
+      - Code Of Conduct: developers/code_of_conduct.md
       - Contributing Guidelines: developers/contributing-guidelines.md
       - Development Setup: developers/development-setup.md
-      - Versions and Releases: developers/versions-and-releases.md
       - Reviewing PRs: developers/review-pr.md
       - Submitting a PR: developers/submit-pr.md
-      - Database Schema: developers/tmschema.md
       - Translations: developers/translations.md
+      - Versions and Releases: developers/versions-and-releases.md
+      - Error Codes: developers/error_code.md
+  - Deep Tech Dives:
       - Data Flow Diagrams: dataflow.md
+      - Database Schema: developers/tmschema.md
+      - Class Hierarchy: apidocs/html/index.html
   - For Sysadmins:
       - Deployment: sysadmins/deployment.md
       - Architecture: sysadmins/architecture.md
       - Migration: sysadmins/migration.md
       - Deployment: sysadmins/deployment.md
       - Customize: sysadmins/customize.md
       - CI: sysadmins/ci-cd.md
-  - Class Hierarchy: apidocs/html/index.html
+  - Working Groups: working-groups.md
   - License: LICENSE.md
 #  - Changelog: CHANGELOG.md