Make endpoint configurable for use with Ollama

[moppman]

Hi Jeff,

your page-summarizer extension looks very cool and handy, so I was wondering if you'd consider making the API endpoint configurable.

Background:
Ollama is a project that enables users to run LLMs locally on their own computers.
A couple of days ago, v0.1.24 gained compatibility with the OpenAI Chat Completions API, which (in theory) means that projects like page-summarizer only need to update their config (mostly API endpoint and models) and everything should "just work" ™️

Thanks, and take care!

[sysread]

That is something that I have been considering adding. It's just a matter of having the time to work on it.