Moved data story into this repo

[coret]

• Moved https://github.com/netwerk-digitaal-erfgoed/stories/tree/master/html/hackalod/datasetregister plus stories/yasgui assets to this repo
• Embedded in site look & feel
• Made biligual
• Changed stories.min.js due to https://github.com/netwerk-digitaal-erfgoed/registry-demo/issues/9
• Changed datastories.netwerkdigitaalerfgoed.nl links to "local" datastory (removed target on these links)

Fix #9