This makes it look as if the site consists mostly of editable plain text. Accordingly, the user interface has been simplified and there are no links to the preview, add, diff and upload actions and the corresponding templates have been deleted. There is no special static or feed template (mostly because the feed would depend on the list of links that isn't rendered).
Now, the text is still saved in Markdown files and the Markdown is still rendered to HTML – but the "view" template just prints the page body inside a "pre" block and ignores the rendered HTML.
This being text files, there are also no links to follow. That is why there's no link here back to themes. Sorry!
This also means that you can only edit new files by editing the URL in the address bar of your browser since you can't link to them.