We have redundant "blog" and "news" pages.

Task: migrate all "news" to "blog" because the navigation is easier, and has better . Some of the "News" are very brief - just a few paragraphs - and could be wrapped into an annual "roundup" page.

Instructions for adding a blog post: https://github.com/PecanProject/PecanProject.github.io?tab=readme-ov-file#add-or-edit-a-blog-post