- Introduced `campaign_type` field in `NewsletterCampaign` model to differentiate between general and weekly newsletters.
- Added `weekly_articles` ManyToMany field to associate articles with weekly newsletters.
- Implemented `item_template_html` for customizing the appearance of articles in weekly newsletters.
- Updated forms and views to handle new fields and validation logic for weekly newsletters.
- Created a new view for selecting newsletter types before creating a campaign.
- Enhanced the newsletter editor UI to show/hide fields based on the selected campaign type.
- Added JavaScript functionality for paginating article selections in the editor.
- Updated CSS for new UI components related to newsletter campaigns.
- Created a migration to add new fields to the `NewsletterCampaign` model.
- Added a template for the newsletter type selection page.
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