Add infrastructure for blog posts

config.toml

content/blog/2024/03/2024-03-10_edupin/edupin.jpg

content/blog/2024/03/2024-03-10_edupin/index.md

content/blog/2024/03/_index.md

content/blog/2024/_index.md

content/blog/_index.md

sass/_content.scss

templates/blog/overview.html

templates/blog/post.html

templates/frontpage/blocks/baustelle.html

templates/frontpage/blocks/blog.html

templates/frontpage/blocks/embed_article.html

templates/frontpage/blocks/news.html

templates/frontpage/blocks/newsletter.html

templates/frontpage/blocks/projects.html

templates/index.html

templates/shortcodes/further.html