create courses page

[ihor-bobyr]

I noticed that #teens in header navigation scrolls lower then I would like to. As a result page header is hidden behind header. Maybe you have idea how we can fix this? For me, the simplest way is to remove anchor from header link

this should work https://github.com/shpp/programming.org.ua/pull/114/commits/2f0e3e6c32b2c19f35c6d574d63edfa5796b2e1b