Merge pull request #1 from mhaberler/master

add note on RTAI kernels
Remove erroneous news navigation from article layout
Fix nav-bar docs link problem

Incomplete fix for #3
Fix `backtick`/<code> style

- Black text on light transparent yellow background
- Remove box-shadow from all <code/> elements
- Fix styling when embedded in <a/>
  - Add "a > code" to other <code/> styles
  - Inherit color from parent styles

Partial fix for #3