Reorganize files a bit
Add a Pagination trait to guide with paging in the future
Add extension traits for Profile, Comment, and Submission
Async-ify more things, but not all things
Add submissions to home page
Add drafts page
Validate handle, display name, description, submission: title, description
Add block checks to submission iterator
Add user info to submission page
Abstract dark preference to a single source, not yet configurable
