Since the site is now Gemini first, it doesn't make sense to use Markdown. In this commit I am refactoring the site generator to remove lowdown and frontmatter dependencies.
While writing a new article, I was having issues with Perl making the replacements (it was trying to execute fenced code blocks). After a little bit of research, trying to keep the original script, I decided to keep things simpler and rewrite the generator script with Python instead.
Reviewed-on: #1
