experimental: migrate to external repo (#26879)

security scanners can't distinguish monorepo sources from each other.
this will resolve issues for folks trying to use e.g. langchain-core but
getting security issues from experimental flagged!

docs/api_reference/conf.py

@@ -26,7 +26,6 @@ from sphinx.util.docutils import SphinxDirective
 _DIR = Path(__file__).parent.absolute()
 sys.path.insert(0, os.path.abspath("."))
 sys.path.insert(0, os.path.abspath("../../libs/langchain"))
-sys.path.insert(0, os.path.abspath("../../libs/experimental"))
 
 with (_DIR.parents[1] / "libs" / "langchain" / "pyproject.toml").open("r") as f:
     data = toml.load(f)

docs/docs/contributing/code/setup.mdx

@@ -73,9 +73,9 @@ make docker_tests
 
 There are also [integration tests and code-coverage](/docs/contributing/testing/) available.
 
-### Only develop langchain_core or langchain_experimental
+### Only develop langchain_core or langchain_community
 
-If you are only developing `langchain_core` or `langchain_experimental`, you can simply install the dependencies for the respective projects and run tests:
+If you are only developing `langchain_core` or `langchain_community`, you can simply install the dependencies for the respective projects and run tests:
 
 ```bash
 cd libs/core
@@ -86,7 +86,7 @@ make test
 Or:
 
 ```bash
-cd libs/experimental
+cd libs/community
 poetry install --with test
 make test
 ```

docs/vercel_requirements.txt

@@ -1,7 +1,6 @@
 -e ../libs/core
 -e ../libs/langchain
 -e ../libs/community
--e ../libs/experimental
 -e ../libs/text-splitters
 langchain-cohere
 urllib3==1.26.19