Blog Post Type: Add support for displaying blog posts

[mplorentz]

Currently, there is a blog post type that doesn't show up at all in Planetary. The data for a blog is organized differently than a post, but the UI does not need to be that different from a post.

Here is some documentation on blogs Here is a message ref to an example blog post, the SSB newsletter from cblgh: %I4gXpjHvRqN93j3C02/n/CwtbwgVEma7lluiis0YezE=.sha256.

Blog posts put the primary content of the post in to the blob which means we could have a follow up post to that tangle requesting the post no longer be stored. This lets us add a feature where we can request deletes.

It's not perfect but it would be supported on existing scuttlebutt apps and implementations.

Displaying blog message types is the first thing, and it'd need some UI, potentially. cc @Chardot

[danlatorre]

What does a Blog mean on SSB? Can people just view "blog posts"? Archive? Categories? Can outside users subscribe to the blog? There are many expected conventions to what a blog is. If it's not really a "blog" then let's not call it a blog? (Same problem w/ "Rooms" and "Pubs" mislabeling)

[mplorentz]

@danlatorre the blog post type on SSB historically is very similar to a post, but has some features for longer-form writing:

• you can add a title, summary, and thumbnail, in addition to the body.
• you can write more than 8 kilobytes/~8000 characters/~1000 words

Can people just view "blog posts"? Archive? Categories?

Yes these are all possible.

Can outside users subscribe to the blog?

Non-ssb users? Not currently. Although it would be relatively easy to tack this feature onto the web viewer stuff we are building.