Redmine issues embed integration

Hi, We use [Redmine ]( extensively for our issue tracking, and it would be really useful to have the ability to embed redmine issues in our outline pages! I was looking through the architecture docs, and would probably mainly base the embedding structure off that of the dropbox embed, as it would be nice to allow users to optionally provide a redmine API key if they wish to embed issues from private projects. It probably makes sense to make this API key optional so public redmine project issues can be embedded with minimal configuration by the host. In the future Redmine may have stronger support for OAuth2 app based integrations, which could lead to a plugin being viable along the same lines as the github integration for example, but for now we're keen to get the embedding functionality working 😄 Redmine unfortunately doesn't provide a nice embedding endpoint natively, but a JSON format endpoint for issues is available, so happy to massage this into something tha…