=> AP: contentMap values should be HTML

[Tamschi]

Current example with plaintext in #1607. It should have the same semantics as content: #1607 (comment)

The properties are in fact mapped to the same key in https://www.w3.org/ns/activitystreams, just with different transforms:

"content": "as:content",
"contentMap": {
    "@id":"as:content",
    "@container":"@language"
},

(This is valid, they just become an array after expansion like this:

"https://www.w3.org/ns/activitystreams#content": [
  {
    "@value": "<p>OMG OMG OMG we're able to bridge our threads accounts into Blue sky via federation <a class=\"mention\" href=\"https://ap.brid.gy/ap.brid.gy\">@ap.brid.gy</a>  & <a class=\"mention\" href=\"https://bsky.app/profile/snarfed.org\">@snarfed.org</a><br><br>RE: <a href=\"https://bsky.app/profile/did:plc:4ghwklnin2mvmam4ditdwv2o/post/3lclod7ptodd2\">https://bsky.app/profile/did:plc:4ghwklnin2mvmam4ditdwv2o/post/3lclod7ptodd2</a></p>"
  },
  {
    "@value": "OMG OMG OMG we're able to bridge our threads accounts into Blue sky via federation @ap.brid.gy  & @snarfed.org",
    "@language": "en"
  }
],

(via https://json-ld.org/playground/)