Apply stb-tester template to blog

Introduces a fair amount of duplication.  Will have to think about how
to reduce this in the future.
Retroactively add some blog entries
Fix deploy blog to github
Makefile: Don't require switching to gh-pages branch during make deploy

Also fixes issue with `make deploy` in that uncreated files are removed.
Blog: Put all posts on same page
Add blog to navigation at top