This pull request adds a new script for docs, which generates missing ref/**/*.md files. The script can be executed when you run make build-docs command. The script does not do:

• overwrite the existing ones
• create files for _XXX.py and __init__.py

Note that the title part is generated like tool_context to Tool Context. openai_provider will be Openai Provider, so some of them needs a little manual work to adjust.

The direct need is to add tool_context.md for #1043 but it should be useful for future maintenance.