Expand Full Node List

The Full Node List can be expanded to utilize @fullnodeupdate metadata to build the list, only falling back on a static list if the query fails.

https://developers.hive.io/quickstart/#quickstart-hive-full-nodes

AC

• Check @fullnodeupdate (e.g., REST get https://hive.blog/@fullnodeupdate.json)
• Build the list of valid nodes from json_metadata.report
• Re-render the table of valid nodes and fall back to the static table if unable to render