Fix some responsive and style

- Fullscreen: center image + add a background color
- Carousel: don't cut informations
- Title location font size
- Style location line height
- Photo reveal effect
- Photo has now a transparent png

src/style/pages/_homepage.scss

@@ -1,6 +1,7 @@
 // Introduction
 .intro {
     background-color: $color-tertiary;
+    overflow: hidden;
 
     // Title
     .title-parallax {