feat: add possibility to add a bucket prefix at deploy

mentioned in commit 5d620922

mentioned in merge request doc!10 (merged)

mentioned in merge request to-be-continuous/samples/mkdocs-on-s3!6 (merged)

mentioned in merge request kicker!33 (merged)

mentioned in merge request to-be-continuous/samples/mkdocs-on-s3!13 (merged)

mentioned in merge request kicker!92 (merged)

mentioned in merge request doc!19 (merged)

mentioned in merge request to-be-continuous/samples/angular-on-s3!81 (merged)

mentioned in merge request cedric3.olivier/mkdocs-on-s3!2 (closed)