ref #7726 Move UI screenshots in the repository using git-lfs

...ed-screenshots/GoalsTable_goals_table_abandoned_carts.png

...expected-screenshots/GoalsTable_goals_table_ecommerce.png

...ted-screenshots/GoalsTable_goals_table_ecommerce_view.png

...s/UI/expected-screenshots/GoalsTable_goals_table_full.png

...UI/expected-screenshots/GoalsTable_goals_table_single.png

tests/UI/expected-screenshots/GoalsTable_initial.png

tests/UI/expected-screenshots/ImageGraph_evolution_graph.png

tests/UI/expected-screenshots/ImageGraph_horizontal_bar.png

tests/UI/expected-screenshots/ImageGraph_pie.png

tests/UI/expected-screenshots/ImageGraph_vertical_bar.png

tests/UI/expected-screenshots/Insights_initial.png

...UI/expected-screenshots/Installation_access_no_config.png

tests/UI/expected-screenshots/Installation_congrats.png

tests/UI/expected-screenshots/Installation_db_created.png

tests/UI/expected-screenshots/Installation_db_setup.png

tests/UI/expected-screenshots/Installation_db_setup_fail.png

tests/UI/expected-screenshots/Installation_js_tracking.png

tests/UI/expected-screenshots/Installation_setup_website.png

.../expected-screenshots/Installation_setup_website_fail.png

tests/UI/expected-screenshots/Installation_start.png