Post Code-Freeze Review, Bugsfixes and Documentation

- Fix traefik Portal Button
- Touchup Security Policies
- Update Support Policies
- Re-Add Deluge as incubator App
- Add Canary to Security Policies
- Add all-contributors basic config

docs/manual/Migration Guides/index.md

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+# Migration Guides
+
+Sometimes we can not guarantee automatic updating between new versions of our Apps.
+These pages include some common scenario's and give some guidance how to manually move between different versions and Trains.
+
+##### Between Trains
+
+An app will always be just in one train. If an App moves to a different train, you will not be able to update automatically
+Our basic guidence for these cases is:
+
+
+- Backup all your files, config and databases.
+- Make notes on how you set up your app previously
+- Delete the old App
+- Install the new app using your previously made setup notes
+- Stop the new App
+- Put back all your old files.
+- Re start the new App
+
+##### Between Versions
+
+When new versions introduce breaking changes (which would often be major version changes) they might(!) require the user to reinstall.
+However: We often already provide migration scrips and dealth with these issues manually.