Removed contents as they were relocated into their own repository
Squashed 'source/00_content/' content from commit 63d9db8

git-subtree-dir: source/00_content
git-subtree-split: 63d9db8438ed6b32c4a85d487c07ea31bda666e4
Merge commit 'dffe5e060399eea7d8a6985664786cc2a5d933ff' as 'source/00_content'