Adding website content to the 'master' branch

This update added a complete set of files and directories to the 'master' branch needed for building a website with _**Hugo**_. As there is no 'gh-pages' branch in the 'ioos/conventions-for-observing-asset-identifiers' repository, the 'gh-pages' content from the 'abirger/conventions-for-observing-asset-identifiers' cannot be pulled, and must be added following the **Website Deployment Workflow**.

Before re-generating the website content in the 'public' directory, the 'baseurl' value has to be changed in the 'config.toml' file from "http://abirger.github.io/conventions-for-observing-asset-identifiers" to "http://ioos.github.io/conventions-for-observing-asset-identifiers" to let _**Hugo**_ properly render the pages.

The **Website Deployment Workflow** was slightly updated to make Step 4 less vague, and emphasize the optional nature of Step 9. This version of the **Workflow** is the most up-to-date; however, it may still require more editing.