Convert plugin to singleton pattern. Rename some methods to prefix `action_` and `filter_` where appropriate.
Remove `error_log` call.
Template tags for creating Facetious URLs. Closes #9.
Use esc_url() in the correct place
Avoid trailing slash issues
Remove debugging, add comment about pretty permalinks
Code tidy up and some type hints
Double-encode slashes in the query vars. Correctly slash $_GET['s'].
Add some basic default styling to fields in the Facetious widget. Fixes #7.