feat: cmd-57 hide articles from latest news

[wesleyboar]

Overview

Allow hiding articles of a certain single category from the news feed.

Status

• [x] exclude article from main news feed
• [x] do not exclude article from category news feed
• [x] make this extensible or customizable
  • add setting that is list of article categories to exclude
  • create block, let custom cms add logic → #752

Related

• CMD-57
• replaced by #752

Changes

• added templatetag blog_post_is_in_category
• changed template to use templatetag blog_post_is_in_category for an "Exclude" Category

Testing

1. Have a CMS with Blog/News installed.
2. Create two new articles.
3. Make one article be in a category "Exclude" (with slug as exclude).
4. Make one article be in a category "Normal Category" (with slug as normal-category).
5. Open News page.
6. ✓ Verify the "Exclude" article is not present.
7. ✓ Verify the other article is present.
8. ✓ Verify "Normal Category" category news feed still shows all its articles.
9. ✓ Verify "Exclude" category news feed still shows all its articles.

UI

All	Normal	Exclude

[wesleyboar]

See #752 instead.

Update: Superseded by CMD-97.

[wesleyboar]

This is superseded by CMD-57.