Rewrite article publication with the REST API

- Add a default App and ApiToken for each user, that is used by the front-end
- Add an API route to update an article (CSRF had to be disabled because of a bug in rocket_csrf)
- Use AJAX to publish and edit articles in the new editor, instead of weird hacks with HTML forms

plume-front/Cargo.toml

@@ -10,3 +10,5 @@ gettext = { git = "https://github.com/Plume-org/gettext/", rev = "294c54d74c699f
 gettext-macros = { git = "https://github.com/Plume-org/gettext-macros/", rev = "a7c605f7edd6bfbfbfe7778026bfefd88d82db10" }
 gettext-utils = { git = "https://github.com/Plume-org/gettext-macros/", rev = "a7c605f7edd6bfbfbfe7778026bfefd88d82db10" }
 lazy_static = "1.3"
+plume-api = { path = "../plume-api" }
+serde_json = "1.0"