Blog cleanup

[pedro-psb]

The majority of blog posts are short announcements, like releases and changes listing, which today are usually done in discourse and go to the changelog.

These are valuable as historical documents, but not very interesting to read.
Cutting down these and leaving more blog-like posts, which tells some relevant story (rather than listings or short annoucements) should make the blog more useful and de-clutter the site search.

Then, the remaining posts may need some fixing on formatting/missing images.
E.g: This post should contain this image.