v0.52

Tagged 0.52.0 to fix docker build action

• [CHANGES] Notification handling improvements #348
• [CHANGES] Use ManifestStaticFilesStorage for cache busting #356
• [DOCUMENTATION] add databse migration command in README.md #358
• [IMPROVEMENT] Change history dropdown #364
• [IMPROVEMENT] Fix Codespell errors #362
• [IMPROVEMENT] Show datasource load with colors #359
• [IMPROVEMENT] Update scrape to mimic Prometheus headers #357