Merge pull request #3 from klick/develop-d

happy
introtext
introtext
header

- hgroup width
- text
header

+ font: Merriweather
+ h3: font-size, line-height, …
+ color changes
+ adress: position & font
changes Head
background-color
less text
video

+ video (html & scss)
video & colors
video bvg_3
smaller video
update (#4)

* Textänderung (del. „happily“)