feat(migrators): remove wunderlist (#1346)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/1346

pkg/swagger/swagger.yaml

@@ -1401,12 +1401,6 @@ definitions:
       message:
         type: string
     type: object
-  wunderlist.Migration:
-    properties:
-      code:
-        description: Code is the code used to get a user api token
-        type: string
-    type: object
 info:
   contact:
     email: hello@vikunja.io
@@ -3484,77 +3478,6 @@ paths:
       summary: Get migration status
       tags:
       - migration
-  /migration/wunderlist/auth:
-    get:
-      description: Returns the auth url where the user needs to get its auth code.
-        This code can then be used to migrate everything from wunderlist to Vikunja.
-      produces:
-      - application/json
-      responses:
-        "200":
-          description: The auth url.
-          schema:
-            $ref: '#/definitions/handler.AuthURL'
-        "500":
-          description: Internal server error
-          schema:
-            $ref: '#/definitions/models.Message'
-      security:
-      - JWTKeyAuth: []
-      summary: Get the auth url from wunderlist
-      tags:
-      - migration
-  /migration/wunderlist/migrate:
-    post:
-      consumes:
-      - application/json
-      description: Migrates all folders, lists, tasks, notes, reminders, subtasks
-        and files from wunderlist to vikunja.
-      parameters:
-      - description: The auth code previously obtained from the auth url. See the
-          docs for /migration/wunderlist/auth.
-        in: body
-        name: migrationCode
-        required: true
-        schema:
-          $ref: '#/definitions/wunderlist.Migration'
-      produces:
-      - application/json
-      responses:
-        "200":
-          description: A message telling you everything was migrated successfully.
-          schema:
-            $ref: '#/definitions/models.Message'
-        "500":
-          description: Internal server error
-          schema:
-            $ref: '#/definitions/models.Message'
-      security:
-      - JWTKeyAuth: []
-      summary: Migrate all lists, tasks etc. from wunderlist
-      tags:
-      - migration
-  /migration/wunderlist/status:
-    get:
-      description: Returns if the current user already did the migation or not. This
-        is useful to show a confirmation message in the frontend if the user is trying
-        to do the same migration again.
-      produces:
-      - application/json
-      responses:
-        "200":
-          description: The migration status
-          schema:
-            $ref: '#/definitions/migration.Status'
-        "500":
-          description: Internal server error
-          schema:
-            $ref: '#/definitions/models.Message'
-      security:
-      - JWTKeyAuth: []
-      summary: Get migration status
-      tags:
-      - migration
   /namespace/{id}:
     post:
       consumes: