[refactor] Use lowercase "utf-8" (1m)
[refactor] Removed unnecessary defaults and overrides from ContentTypes (20m)
[refactor] Removed extra relationships and added more tests (10m)
[refactor] Removed unnecessary CorePart (1m)
[refactor] Removed WebSettingsPart and added SettingsPart (15m)
[skip] Used double quotes instead of single quotes (1m)
[skip] Added the styles part (20m)