Website vs. web page. A website (usually one word, though a few publishers use Web site or web site) is a collection of linked documents and content associated with a single organization, person, group, or topic and usually sharing a server and a domain name. A web page (usually two words) is a single page of content on a website.
The Marvel Netflix shows seem to take place around the same time as they were filmed. Iron Fist filming happened April-October 2016. Clues in the show point to the season happening over the course of a month, maybe a month and a half, so I'd say it takes place right before Civil War.
The beginning of Iron Age varies as per the regions and it is evident that every region that experienced this time period had actually had it in an exclusive time period which was different from every other region in this case. In China, Iron Age began around 600 B.C. In ancient periods of Korea and Japan, the Iron Age is considered to begin during 500 to 400 B.C. As per the Britannica Encyclopedia, iron was used under limitations in the ancient Middle East during 3000 B.C. It claims that metal was much more dominant in that region at that particular time.