Magenta screen page

[netham91]

The Random Particles demo (color_fish_tank.html) requires a magenta colored object. One possible way is having a magenta screen on your mobile, which acts as the required magenta colored object. It's accurate too.

So I have done the following changes

• Added a magenta full screen -> color_magenta_screen.html . It follows the same layout as the other pages with a bar on the top and link to tracking.js homepage.
• Created a short url get.al/magenta so that it can be quickly accessed on mobile. It links to https://trackingjs.com/examples/color_magenta_screen.html
• Added a message on color_fish_tank.html to access the short url.