Remove all references for 3rd-parties from "apache" PMC sites

[potiuk]

There are a few (very few) references to Dagworks on the burr.apache.org that should likely be moved to "apache.org" space or removed (one notable here https://burr.apache.org/examples/chatbots/gpt-like-chatbot/ where Burr is mentioned as "by Dagworks". Those ar small things, but - as I wrote on the Hamilton list, it's a healthy approach where all 3rd-party links referred from the .apache.org (i.e. PMC communication) are grouped together in a place where it's clear that those 3rd-parties are not endorsed or controlled by PMC (https://airflow.apache.org/ecosystem/) - and where anyone can add any relevant link.

Decisions on what to do and how to approach it should be made - likely by PPMC before it is executed.