Create GH Actions workflow for templating a blog post

[zenlex]

This project pulls blog posts from markdown files in the repository dynamically. New posts can be created simply by merging markdown files where the path is /src/pages/blog/{slug}. The action should be configured for manual triggering with these inputs:

• title
• author

The action should:

• generate a url safe simple slug (see examples in src/pages/blog)
• checkout the current content/blog branch
• create an index.md file at /pages/blog/{slug}
• the index.md file should contain frontmatter in the following format:

---
- title: {user title from workflow trigger}
- author: {user author from workflow trigger}
- date: {current date as ISO-8601 string}
- content-type: "blog | project | event" (each document will only be one type)
- publish: true | false
---

• commit the changes and push to content/blog
• generate pr from content/blog -> dev
• bonus points if it redirects to the newly created index.md