Docs refactor (#480)

Big docs refactor! Motivation is to make it easier for people to find
resources they are looking for. To accomplish this, there are now three
main sections:

- Getting Started: steps for getting started, walking through most core
functionality
- Modules: these are different modules of functionality that langchain
provides. Each part here has a "getting started", "how to", "key
concepts" and "reference" section (except in a few select cases where it
didnt easily fit).
- Use Cases: this is to separate use cases (like summarization, question
answering, evaluation, etc) from the modules, and provide a different
entry point to the code base.

There is also a full reference section, as well as extra resources
(glossary, gallery, etc)

Co-authored-by: Shreya Rajpal <ShreyaR@users.noreply.github.com>

docs/conf.py

@@ -22,13 +22,15 @@ with open("../pyproject.toml") as f:
 
 # -- Project information -----------------------------------------------------
 
-project = "LangChain"
+project = "🦜🔗 LangChain"
 copyright = "2022, Harrison Chase"
 author = "Harrison Chase"
 
 version = data["tool"]["poetry"]["version"]
 release = version
 
+html_title = project + " " + version
+
 
 # -- General configuration ---------------------------------------------------
 
@@ -42,10 +44,11 @@ extensions = [
     "sphinx.ext.napoleon",
     "sphinx.ext.viewcode",
     "sphinxcontrib.autodoc_pydantic",
-    "myst_parser",
-    "nbsphinx",
+    "myst_nb",
     "sphinx_panels",
+    "IPython.sphinxext.ipython_console_highlighting",
 ]
+source_suffix = [".rst", ".md"]
 
 
 autodoc_pydantic_model_show_json = False
@@ -73,8 +76,7 @@ exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = "sphinx_rtd_theme"
-# html_theme = "sphinx_typlog_theme"
+html_theme = "sphinx_book_theme"
 
 html_context = {
     "display_github": True,  # Integrate GitHub
@@ -88,3 +90,5 @@ html_context = {
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path: list = []
+nb_execution_mode = "off"
+myst_enable_extensions = ["colon_fence"]