* Add GET requests to webhook

* make fmt

* Handle invalid http method on webhook

* Uppercase http method in webhook

* Rename v85.go to v86.go

* make fmt

* add migration and basic UI for changing a user's theme

* update user themem

* use right text on button

* load theme based on users' selection

* load theme based on users' selection in pwa too

* update sample config

* delete older theme loading

* implement AfterLoad to set users' theme properly

* set up default theme when creating a user. This uses the installation wide theme

* use flash messages for error

* set default theme when creating a user from the cli

* fix @lunny review