Update example blog to Hugo v0.12 conventions

- Convert config.yaml to config.toml to follow what
  `hugo new site /path/to/site` generates
- Rename layouts/chrome to layouts/partials
- Convert `template` calls to `partial` calls
- Minor revisions to the text in example content
- Upgrade Bootswatch Yeti theme (3.1.1+1 → to 3.2.0+3)
- Upgrade Font Awesome (4.0.3 → 4.2.0)
- Upgrade jQuery (1.11.0 → 1.11.1)