feat: add new icons #2676 by @alexio-dev (#2678)

* feat: add new improved logo

* feat: add new improved logo

* feat: add new improved logo

* feat: add new improved logo

* chore: update the logos in app

* Merge branch 'alexio-dev-refactor/new-icons' into refactor/new-icons #2676

* chore: generate icons for every flavor

* chore: add readme banner

* chore: add back deleted images

* chore: update native splash screen

* chore: fix dart analyzer warnings