docs: Refine docs (#200)

* Update docs

* update one demo video

* update docs

* remove the video

* move configuration file

* fix demo title

docs/project_framework_introduction.rst

@@ -23,19 +23,5 @@ We have established a basic method framework that continuously proposes hypothes
 The figure above shows the main classes and how they fit into the workflow for those interested in the detailed code.
 
 
-Detailed Design
-=========================
-
-
-Configuration
--------------
-
-You can manually source the `.env` file in your shell before running the Python script:
-Most of the workflow are controlled by the environment variables.
-```sh
-# Export each variable in the .env file; Please note that it is different from `source .env` without export
-export $(grep -v '^#' .env | xargs)
-# Run the Python script
-python your_script.py
-```
-
+.. Detailed Design
+.. ===============