Classnotes Templates for Easier Post-Event Material Generation

The current process for generating event/training classnotes is tedious. It also includes copy-pasting of resources. This workflow needs to :skull:.

This undertaking separates the teacher information (name, GitHub link, Twitter handle), resources, and CLI to maintain a DRY approach to the content and allow simpler maintainence of resources across all post-event classnote documents.

The new classnotes markdown will now focus on the page's content by means of the YAML, and the content body being the _only_ custom field for CLI.

```
---
layout: classnote
title: Template Class Notes Title
description: Sample description of event
eventdate: 2013-12-12
tags: [notes]
teacher:
- teachers/jordanmccullough
---
```