closes: https://github.com/TryGhost/Ghost/issues/14973
- When fetching content using a non-standard charset, characters were notproperly decoded to utf-8 resulting in mangled text in the editor -> Detect charset and use iconv to decode the page text
- When requesting a non bookmark card, if no oembed data could be foundand we fallback to bookmark, a second network request to fetch the content was issued. This seemed unnecessary -> refactored to avoid that
75811f35bc