Update felix_&_herbert.md
First pass at lesson 01.
Merge remote-tracking branch 'upstream/master'
Fix URL in example pull request
Add build instructions to README
Update README
Added files for lesson 02, untranslated.
update fogos de artificio
update lessons to adapt to style
updating
added layout
update layout
update layout
update corrida no deserto
rename title
[en-GB] Fixed typo in lesson 3
added images
update title
update index
minor fix