* DONE Pin *-versions in cargo.toml
* DONE Markdown support
* DONE Post ordering as expected
* DONE Stickies!
* DONE Search
* DONE Post editing
* TODO Configurable number of DB workers
* TODO Match certain types of Diesel errors (esp. for "not found")
* TODO Sketch out categories vs. tags system
* TODO Quote button
* TODO Multiquote buttons
* TODO Pagination
* TODO Multi-thread guest accounts