docs: drop remaining GitHub mentions (CONTRIBUTING/SECURITY/.gitignore)

CONTRIBUTING.md

@@ -6,9 +6,8 @@
 
 ```
 vrcx/
-├── .github/
-│   ├── workflows/release.yml          ← CI: tag-driven build + GitHub Release
-│   └── ISSUE_TEMPLATE/                ← bug / feature / security routing
+├── .gitea/
+│   └── workflows/release.yml          ← CI: tag-driven build + Gitea Release
 ├── dev/                               ← current work (everything code-related lives here)
 │   ├── src/vrcx/
 │   │   ├── __init__.py                ← single source of truth for __version__
@@ -17,7 +16,7 @@ vrcx/
 │   │   ├── config.py                  ← config.ini next to the exe (first-run prompt)
 │   │   ├── i18n.py                    ← EN/RU translation table + t() helper
 │   │   ├── platform_win.py            ← VT enable
-│   │   ├── update_check.py            ← GitHub /releases/latest poll (returns tag)
+│   │   ├── update_check.py            ← Gitea /releases/latest poll (returns tag)
 │   │   ├── commands.py                ← BMC artefacts table
 │   │   ├── bmc.py                     ← BmcSession (SSH + Redfish helper)
 │   │   ├── collector.py               ← per-host BMC collect loop
@@ -72,7 +71,7 @@ python -m PyInstaller --onefile --console --name vrcx \
 4. Tag: `git tag vX.Y.Z`.
 5. Push: `git push && git push --tags`.
 
-CI builds the exe and creates the GitHub Release with the zip attached.
+CI builds the exe and creates the Gitea Release with the zip attached.
 
 ## Where features go