refactor: move tag indexing of posts to Posts

feat: add tags endpoint

feat: add single post endpoint

chore: ensure test files are prettier

refactor(posts): Clarify what options are for

refactor: metadata -> posts

fix(metadata): make return values consistent

chore: configure tern

feat: Parse front matter as metadata

Move tests to test/

feat: Use nunjucks templates via koa-nunjucks-next

chore: Set up pre-commit hook for formatting

chore: add editorconfig file

feat: setup basic web server

chore: Configure formatting with prettier and standard

Initial commit