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Update DEPLOY.md

The admin username and password have changed so I had to look them up in the config file.
Merge pull request #51 from Norrit/patch-1

Update default admin username and password in deployment description
Clarified self-hosted section of DEPLOY.md

Reformatted steps to be easier to read and more consistent with the other sections.
Added username/password keys to example database.yml.
Added config.serve_static_assets section.
Added default user/password info from above since it's easy to miss.
Merge pull request #58 from scotje/patch-1

Clarified self-hosted section of DEPLOY.md