Adds Bureau yml and marks to About page

- Adds yml data file with info about each of the DOI bureaus.
- Adds marks for each of the DOI bureaus. They are of varying quality; depended on the agency what file format, size, etc I was able to fine.
- Changes about.md to about.html in order to add more complex layouts to that page.
- Adds a Jekyll chunk to About page to pull in the bureau data file.