Landing page template and texts

[sirex]

Create new template for landing page and move list of projects to top menu.

In landing page template add few sentences about what are Python workshops, and who can attend.

[sirex]

https://github.com/python-dirbtuves/website/blob/landing-page/pylab/website/static/img/glyder_snake.png

[sirex]

Take Albertas's images from landing-page branch, and you can delete that branch and move your code to it.