Resolve "Add light/dark theme selector"

Closes #64

See merge request !60

Merge branch '63-improve-ci-cd-remove-update-step-disable-build-debug-in-master-branch' into 'master'

Resolve "Improve CI/CD, remove "update" step, disable "build-debug" in master branch"

Closes #63

See merge request !59

Resolve "Avoid print calls in production code"

Closes #62

See merge request !58

Resolve "Remove deprecation in flutter gradle plugin"

Closes #61

See merge request !57

Resolve "Use flutter linter and apply lints"

Closes #60

See merge request !56

Resolve "Improve day/hour scatter chart"

Closes #59

See merge request !54

Resolve "Swap vertical titles in main timeline chart"

Closes #58

See merge request !53

Resolve "Improve / clean some code"

Closes #56

See merge request !52

Resolve "Show last discovered artists and tracks"

Closes #53

See merge request !50

Resolve "Improve navigation bar"

Closes #51

See merge request !49

Resolve "Add username in settings page"

Closes #52

See merge request !48

Resolve "Improve settings page"

Closes #50

See merge request !46

Resolve "Improve distributions page"

Closes #49

See merge request !44

Resolve "Fix get heatmap from cache"

Closes #48

See merge request !45

Resolve "Autosave settings"

Closes #47

See merge request !43

Resolve "Add a "day/time" heatmap"

Closes #45

See merge request !41

Resolve "Merge days count settings for counts_by_day and count_by_hour"

Closes #46

See merge request !42

Resolve "Fix chart when empty or loading data"

Closes #43

See merge request !40

Resolve "Refresh on pull down"

Closes #6

See merge request !28

Resolve "Add "top artists" streamline"

Closes #33

See merge request !39