Resolve "Remove deprecation in flutter gradle plugin"

Closes #9

See merge request !6

Resolve "Use flutter linter and apply lints"

Closes #8

See merge request !5

Resolve "Upgrade framework, build tools and dependencies"

Closes #7

See merge request !4

Resolve "Fix f-droid category metadata"

Closes #6

See merge request !3

Resolve "Create empty application"

Closes #1

See merge request !1