feat(recipe): add our first recipe Summarize (#2028)

* feat: add summary recipe

* test: add summary tests

* docs: move all recipes docs

* docs: add recipes and summarize doc

* docs: update openapi reference

* refactor: split method in two method (summary)

* feat: add initial summarize ui

* feat: add mode explanation

* fix: mypy

* feat: allow to configure async property in summarize

* refactor: move modes to enum and update mode explanations

* docs: fix url

* docs: remove list-llm pages

* docs: remove double header

* fix: summary description

fern/docs.yml

@@ -74,14 +74,16 @@ navigation:
             path: ./docs/pages/ui/gradio.mdx
           - page: Alternatives
             path: ./docs/pages/ui/alternatives.mdx
-  # Small code snippet or example of usage to help users
   - tab: recipes
     layout:
-      - section: Choice of LLM
+      - section: Getting started
         contents:
-          # TODO: add recipes
-          - page: List of LLMs
-            path: ./docs/pages/recipes/list-llm.mdx
+          - page: Quickstart
+            path: ./docs/pages/recipes/quickstart.mdx
+      - section: General use cases
+        contents:
+          - page: Summarize
+            path: ./docs/pages/recipes/summarize.mdx
   # More advanced usage of PrivateGPT, by API
   - tab: api-reference
     layout: