add anti-fragility shell article
start time changed
add book links
add some links
Merge branch 'master' into draft
update amazon link
add intro
robustness
more content in robustness section.
more errors as input content.
finishing changes to anti-fragility article.
remove non working amazon afiliate link
anti fragile tweaks.
more conclusion on anti-fragitlity
fix typo
more typo fixes.
Merge remote-tracking branch 'origin/master' into draft
ending & tweaks
fixes
change title and small tweaks