Allow bookmarks to have empty title and description (#843)

* add migration for merging fields

* remove usage of website title and description

* keep empty website title and description in API for compatibility

* restore scraping in API and add option for disabling it

* document API scraping behavior

* remove deprecated fields from API docs

* improve form layout

* cleanup migration

* cleanup website loader

* update tests

bookmarks/tests/helpers.py

@@ -41,8 +41,6 @@ class BookmarkFactoryMixin:
         title: str = None,
         description: str = "",
         notes: str = "",
-        website_title: str = "",
-        website_description: str = "",
         web_archive_snapshot_url: str = "",
         favicon_file: str = "",
         preview_image_file: str = "",
@@ -64,8 +62,6 @@ class BookmarkFactoryMixin:
             title=title,
             description=description,
             notes=notes,
-            website_title=website_title,
-            website_description=website_description,
             date_added=added,
             date_modified=timezone.now(),
             owner=user,