Basic blog rendering and linking.
Some work on series linkage
Copy assets from template directory to output directory
Prev/Next links; go fmt
Fix up line ending mess.
Refactor post.go rendering code.
Separate "analysis" pass to extract post info.
Intra-post linkage using special markup.
Generate archives.
Refactor: introduce "Blog" structure for context.
Keep explicit list of static files.
Fix some typos.
Close output files earlier.
Image support. (Copy over files to contents)