Add is_draft field to base model and update views and templates

[simonw]

Add is_draft boolean field to BaseModel and update views, templates, and feeds to handle draft items.

• Model Changes:

  • Add is_draft boolean field to BaseModel in blog/models.py, defaulted to False.

• View Changes:

  • Update index view in blog/views.py to filter out items with is_draft set to True.
  • Update archive_item view in blog/views.py to inject is_draft variable into the template context and add a warning for draft items.

• Feed Changes:

  • Update items method in Entries, Blogmarks, and Everything classes in blog/feeds.py to filter out items with is_draft set to True.

• Template Changes:

  • Add a warning for draft items with a pink background and red border in templates/entry.html, templates/blogmark.html, and templates/quotation.html.

• Test Changes:

  • Add tests in blog/tests.py to verify that draft items are not displayed on the homepage, archive pages, and Atom feeds.
  • Add tests to verify that draft items display a warning on individual item pages.

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