Paperead

- Add full-screen and reader mode.
- Add basic-auth for server.

- Add outlines for contents.
- Fix dark mode's markdown rendering.
- Use vditor's builtin relative url resolver.

Fix build&frontend bugs.

- Use yaml as config file format
- Add API metadata endpoint

- Add configuration file
- Add static website generator
- Publish [homepage](https://paperead.netlify.app/) on netlify
- Fix frontend reactive rendering

- Use tornado as HTTP server
- Add dark theme and 404 page
- Support custom server port