Make ktem official (#134)

* Move kotaemon and ktem into same folder

* Update docs

* Update CI

* Resolve mypy, isorts

* Re-allow test pdf files

libs/ktem/README.md

@@ -0,0 +1,24 @@
+# Example of MVP pipeline for _example_
+
+## Prerequisite
+
+To run the system out-of-the-box, please supply the following environment
+variables:
+
+```
+OPENAI_API_KEY=
+OPENAI_API_BASE=
+OPENAI_API_VERSION=
+SERPAPI_API_KEY=
+COHERE_API_KEY=
+OPENAI_API_KEY_EMBEDDING=
+
+# optional
+KH_APP_NAME=
+```
+
+## Run
+
+```
+gradio launch.py
+```