added similar artists to the bottom of the artist pages (requires last.fm api)
auth: added simple auth with optional AUTH_PASSWORD variable
added all of @ggfevans suggestions cuz he seems like he knows what hes talking about:
- MusicBrainz User-Agent compliance
- Input validation on MBID parameters
- Redundant delays after MusicBrainz requests
- Settings endpoint field whitelist
- Health check improvement
- Security headers
Full Changelog: v0.6.0...v0.7.0