Add ditaa support for internal blog

Use https://github.com/matze/jekyll-ditaa.
Commit: 9ad860a6be6cbe738eb02e7b58a7d8fb993f5018

Signed-off-by: Marc Koderer <m.koderer@telekom.de>
Test ditaa page
Adapt config
Merge pull request #1 from mkoderer/network_throughput

Network throughput