DCAR Dev Server Refactor

[JamieB-gu]

Making it easier to use the DCR dev server, and in particular improving how examples of articles with different formats and features are surfaced.

### Tasks
- [x] Add TS checking
- [x] Add articles to the list in browsers where the clipboard feature isn't supported
- [x] Add format and features to article representations
- [ ] Refactor the article lists
- [ ] Add "supported by DCR/AR" to examples
- [ ] Filters for the table
- [ ] Auto-generate article data based on URL