Endpoint to return a list of posts

[fennifith]

Implement a GET /posts endpoint that allows pagination through all posts, and returns the full data required to display the post card (banner URL, title, author id/name, excerpt, publish date, word count, tags)

Query parameters:

• page=1
• limit=20
• sort=date
• author=crutchcorn

This should implicitly filter out posts without a publishedAt date, or where noindex=true.

NOTE: excerpt, word count, and tags are not currently in the posts db table