Adding all possible configurable ENV variables to documentation

[ChrisDryden]

Was looking through the source code to check to see if there were any locations where an ENV variable could be set to possibly disable citations and I came across a bunch of useful ENV variables that could be set like: USE_BUILTIN_RIPGREP and THINKING_TOOL

Would it be possible to add all of these configurable ENV Variables to the documentation so that users can know that they can set these?

Side note, any chance I could get access to tengu, sherlock or paprika 🙏