I've been looking for a Mastodon Thread Renderer and finally found code and demo site for one at https://github.com/vrutkovs/masto-thread-renderer

It also can export Markdown code for the thread (including links though not image links).

==> Does anyone know of similar code or app for outputting an entire Mastodon thread as an HTML page? Alternately, use the Mastodon API to get the thread's data and outputting a web page from it? For example, the API could easily be used to create a sqlite database using sqlite-utils, but does anyone have an app or code to create a web page of the entire thread (including images) from that?

Found Mastodon Thread Renderer code and demo site at https://github.com/vrutkovs/masto-thread-renderer

Demo site: https://thread.choomba.one/