Use slightly nicer trademark logo in README #152

Job	Run time
build (ubuntu-latest, ci-dev-client-only-qt5, 5.15)	3m 41s
build (ubuntu-latest, ci-dev-client-only-qt6, 6.5.*, qtshadertools qtscxml)	4m 45s
build (ubuntu-latest, ci-dev-client-and-ui-qt5, 5.15)	6m 32s
build (ubuntu-latest, ci-dev-client-and-ui-qt6, 6.5.*)	8m 19s
build (windows-latest, ci-dev-client-only-qt5, 5.15)	4m 25s
build (windows-latest, ci-dev-client-only-qt6, 6.5.*, qtshadertools qtscxml)	6m 30s
build (windows-latest, ci-dev-client-and-ui-qt5, 5.15)	7m 25s
build (windows-latest, ci-dev-client-and-ui-qt6, 6.5.*)	10m 18s
build (macos-latest, ci-dev-client-only-qt5, 5.15)	5m 57s
build (macos-latest, ci-dev-client-only-qt6, 6.5.*, qtshadertools qtscxml)	4m 24s
build (macos-latest, ci-dev-client-and-ui-qt5, 5.15)	15m 1s
build (macos-latest, ci-dev-client-and-ui-qt6, 6.5.*)	14m 45s
	1h 32m 2s

Provide feedback